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Q.

The speed-time graph of a car of 1000 given in kg mass is the adjoining figure. For which time interval is there no force acting?

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a

150 m/s

b

250 m/s

c

200 m/s

d

300 m/s

answer is A.

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Detailed Solution

From the given figure it can be said that an force acts on the body between the time interval 0 s to 4 s and 8 s to 12 s. In the interval 0 s to 4 s, the force increases the speed of the body and in the interval 8 s to 12 s, the force decreases the speed of the body. In the time interval 4 s to 8 s, no force acts on the body as the speed of the body is constant.

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