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Motion with variable acc..



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Q1. A Boeing 747 aircraft has a landing speed of 72 m/s, and upon landing it is able to come to a stop in 2,000 m. Assuming constant deceleration, how long would it take for a Boeing 747 to come to a full stop?

(a) 14 seconds
(b) 28 seconds
(c) 56 seconds
(d) 76 seconds

Q2. An ambulance is currently traveling at 15m/s, and is accelerating with a constant acceleration of 5 m/s^22squared . The ambulance is attempting to pass a car which is moving at a constant velocity of 30m/s. How far must the ambulance travel until it matches the car’s velocity?

(a) 67.5 km
(b) 67.5 m
(c) 75.7m
(d) 75

Q3. A body starting from rest covers a distance of 9 m in the fifth second. The acceleration of the body is:

(a) 2 m/s2
(b) 0.2 m/s2
(c) 1.8 m/s2
(d) 4 m/s2

Q4. Find the incorrect statement out of the following:

(a) If acceleration = 0, motion is uniform
(b) If acceleration = constant, acceleration is uniform but motion not
(c) If acceleration ¹ constt., both acceleration and motion are not uniform
(d) Acceleration = constt., both acceleration and motion are uniform

Q5. The displacement s of a point moving in a straight line is given by:s = 8t2 + 3t – 5, ‘s’ being in cm and t in s. The initial velocity of the particle is:

(a) 3 cm/s
(b) 16 cm/s
(c) 19 cm/s
(d) 0

Q6. Which of the following statements is incorrect?

(a) A body can have constant speed but varying velocity
(b) A body can have constant velocity but varying speed
(c) A body can have acceleration without having velocity
(d) A body can have velocity without having acceleration

Q7. If a particle travels a linear distance at speed u1 and comes back along the same track at speed u2:

(a) Its average speed is arithmetic mean
(b) Its average speed is geometric mean
(c) Its average speed is harmonic mean
(d) None of these

Q8. If velocity of a particle is given by v = 10 + 2t2 m/s, the average acceleration between 2 sec and 5 sec is

(a) 2 m/s2
(b) 4 m/s2
(c) 12 m/s2
(d) 14 m/s2

Q9. In a velocity time graph, velocity is proportional to time. It has got

(a) Increasing acceleration
(b) Decreasing acceleration
(c) Zero acceleration
(d) None of these.

Q10. Tripling the speed of a motor car multiples the distance needed for stopping it is

(a) By 9 times
(b) By 6 times
(c) By 3 times
(d) By 5 times


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1 Answer
811 views

A Boat Travels 50 Km Due East, Then 120 Km Due North And Finally It Comes Back To The Starting Point Through The Shortest Distance.

Modified 20 Year Ago

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A Boat Travels 50 Km Due East, Then 120 Km Due North And Finally It Comes Back To The Starting Point Through The Shortest Distance.

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1 Answer
434 views

An Object Is Dropped From Rest. Its V-t Graph Is

Modified 15 Year Ago

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An Object Is Dropped From Rest. Its V-t Graph Is

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Three Identical Particles Are Joined Together By A Thread As Shown In Figure

Modified 200 Year Ago

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Three Identical Particles Are Joined Together By A Thread As Shown In Figure

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1 Answer
405 views

In 1.0s, A Particle Goes From Point A To Point B

Modified 200 Year Ago

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In 1.0s, A Particle Goes From Point A To Point B

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1 Answer
401 views

A Cyclist Turns Around A Curve At 15 Miles/hour

Modified 217 Year Ago

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A Cyclist Turns Around A Curve At 15 Miles/hour

0 votes
1 Answer
392 views

A Wheel Of Radius 1 M Rolls Forward Half A Revolution On A Horizontal Ground. The Magnitude To The Displacement Of The Point Of The Wheel Initially In Contact With The Ground Is

Modified 13 Year Ago

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13 Year Ago

A Wheel Of Radius 1 M Rolls Forward Half A Revolution On A Horizontal Ground. The Magnitude To The Displacement Of The Point Of The Wheel Initially In Contact With The Ground Is

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