Q.

An object with a mass 10 kg moves at a constant velocity of 10 m/sec. A constant force then acts for 4 second on the object and gives it a speed of 2 m/sec in opposite direction. The acceleration produced in it, is

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a

0.3 m/sec2

b

-0.3 m/sec2

c

-3 m/sec2

d

3 m/sec2

answer is B.

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Detailed Solution

a¯=v2v1t=(2)(+10)4=124=3 m/s2

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