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An object of mass 5 kg is moving with a constant velocity of 10 m s-1. A constant force acts on it opposite to its velocity 4 seconds and gives it a velocity of 2 m s-1 in the opposite direction. The acceleration produced by the force is

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a

2 m s-2

b

3 m s-2

c

4 m s-2

d

5 m s-2

answer is B.

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Detailed Solution

Using V = u + at, we can write −2=10+a×4⇒a=−3m/s2 (Retardation)∴  Acceleration produced =3 m/s2
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An object of mass 5 kg is moving with a constant velocity of 10 m s-1. A constant force acts on it opposite to its velocity 4 seconds and gives it a velocity of 2 m s-1 in the opposite direction. The acceleration produced by the force is