# A batsman deflects a ball of mass 0.15 kg by an angle of 45° without changing its initial speed which is equal to 54 km/h. Then impulse imparted to the ball is:

Subtopic:  Application of Laws |
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The figure shows the position-time graph of a body of mass 0.04 kg. Then the magnitude of each impulse is:

Subtopic:  Application of Laws |
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A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of 15 m/s. How long does the body take to stop?

(1) 6 sec

(2) 5 sec

(3) 7 sec

(4) 4 sec

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A constant force acting on a body of mass 3.0 kg changes its speed from 2.0 m/s to 3.5 m/s in 25 sec. The direction of the motion of the body remains unchanged. What is the magnitude and direction of the force?

(1) 0.18 opposite to the direction of motion.

(2) 0.18 along the direction of motion.

(3) 0.16 along the direction of motion.

(4) 0.16 opposite to the direction of motion.

Subtopic:  Application of Laws |
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A body of mass 5 kg is acted upon by two perpendicular forces, 8 N and 6 N. The magnitude of the acceleration of the body is:
1.  0.99 ms-2
2.  3 ms-2
3.  2 ms-2
4.  0.77 ms-2

Subtopic:  Newton's Laws |
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The driver of a three-wheeler moving with a speed of 36 km/h sees a child standing in the middle of the road and brings his vehicle to rest in 4.0 s just in time to save the child. What is the average retarding force on the vehicle?

(The mass of the three-wheeler is 400 kg and the mass of the driver is 65 kg.)

Subtopic:  Application of Laws |
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A bob of mass 0.1 kg hung from the ceiling of a room by a string 2 m long is set into oscillations. The speed of the bob at its mean position is . What is the trajectory of the bob if the string is cut when the bob is at its mean position?

(1) Parabolic path

(2) elliptical path

(3) circular path

(4) Straight-line path

Subtopic:  Application of Laws |
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A man of mass 70 kg stands on a weighing scale in a lift that is moving. What would be the reading if the lift mechanism failed and it hurtled down freely under gravity?

(1) 105 kg

(2) 70 kg

(3) 0

(4) 10 kg

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The figure shows the position-time graph of a particle of mass 4 kg. What is the force on the particle for t > 4 s?  (Consider one-dimensional motion only).

1. 0

2. 40 N

3. 20 N

4. 10 N

Subtopic:  Application of Laws |
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Two billiard balls each of mass 0.05 kg moving in opposite directions with speed 6 m/s collide and rebound with the same speed. What is the impulse imparted to each ball due to the other?

Subtopic:  Application of Laws |
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