Question

A car moving at a velocity of 72km/hr. Suddenly brakes are applied so as to stop the car at a distance of 10m. Find the force exerted by the brakes on the car if the total massof car and passengers =100kg

Answer 1

v^2-u^2=2as
0^2-20^2=2a*10
-20^2=2a*10
-400=2a*10
-400/10=2a
-40=2a
a=-40/2
a=-20m/s^2
f=ma
=100*(-20)
=-2000N

Answer 2

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