A o.1 kg body moves at a constant speed of 10 m/s. It is pushed by applying a constant force for 2 sec. Due to this force , it starts moving exactly in the opposite direction with a speed of 4 m/s ./ Then Options: A . &nbspthe deceleration of the body is 7 m/`s^2` B . &nbspthe magnitude of change in momentum is 1.4 kg m/sec C . &nbspimpulse of the force is 1.4 Ns D . &nbspthe force which acts on the ball is 0.7 N E . &nbspall the above

A o.1 kg body moves at

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Question -

A o.1 kg body moves at a constant speed of 10 m/s. It is pushed by applying a constant force for 2 sec. Due to this force , it starts moving exactly in the opposite direction with a speed of 4 m/s ./ Then

Options:

A . the deceleration of the body is 7 m/`s^2`

B . the magnitude of change in momentum is 1.4 kg m/sec

C . impulse of the force is 1.4 Ns

D . the force which acts on the ball is 0.7 N

E . all the above

Answer: Option E

`a = (v - u)/(t) = (-4 - 10)/(2)` = - 7 m/`s^2`

The magnitude of change in momentum

= `[m(v - u)]`

= 1.4 kg m/s = Impulse

Now, F = ma = 0.7 N

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