Question

car of mass 400 kg is moving with velocity 72 km/hr. When brakes are
applied, it covers a distance of 10m before coming to rest. What is the average braking force on the car?

Answer 1

Answer:

3rd equation of motion

v^2 = u^2 - 2aS

V^2 = 0

u^2 = 2aS

a = u^2/2S

a = 20×20/20

a = 20m/s^2

F = ma

F = 400 × 20

F = 8× 10^3 N

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