Question

A motor car running at 7m/s can be stopped by applying brakes in 10m.show that total resistance to the motion,when brakes are on is one fourth weight of car

Answer 1

Answer:

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Explanation:

For the motor car;

u = 7 m/s; v = 0; s = 10 m.

Using, v2 = u2 + 2as, we get

 

If we consider, g = 9.8 m/s2, then we get

 

Thus, the resistance to the motion, that is resistive force is

This is one fourth the weight of the car