Question

A motorcycle is moving with a velocity of 90km/hr and takes 10 secs to stop after the brakes are applied. In the mass of the motorcycle alone with the rider is 200kg,the force exerted by the brakes is

Answer 1

Hey dear here is your answer!!!!!

Firstly we have to find acceleration for finding force so ;

Given :- v = 0
t = 10 sec
u = 25m/s
Acceleration = v-u/t
a = -2.5 m/s^2
Since acceleration is negative it means it is retarding.

Force = mass × acceleration
= 200 × (-2.5 )
= - 500 N

It means it is applied on the opposite direction .

Hope it helps u dear...☺️☺️☺️

Answer 2

90km/hr=90×1000/3600=25min/sec
acceleration=25/10=2.5min/sec^2
force=200×2.5=500N