Answers

2014-04-21T15:00:59+05:30
See for change in velocity there must be net force
According to newton's 2nd law
rate of change of momentum is directly proportional to net force
so as there no change in speed or velocity there is no change in momentum so if the change in momentum is zero the force is zero
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2014-04-21T15:05:09+05:30
Rate of change of momentum is zero
so net force is zero
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