Questions
A car moving at a speed v is stopped by a retarding force F in a distance s. If the speed of the car was 3v, the force needed to stop it within the same distance s will be
detailed solution
Correct option is C
Let m be the mass of the car and a be the deceleration produced by force F, then F= ma, where a is given by 2as=v2 or a=v22s.Therefore, F=mv22s.Thus F∝v2. If v is increased by 3 times, F will increase by 9 times.Talk to our academic expert!
Similar Questions
A block of mass kg rests on a horizontal frictionless xy-plane. What would be the acceleration of the block if it is subjected to two forces as shown in figure?
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