A motor car is moving with a velocity of 108 km per hour and it takes 3 sec to stop after the brakes applied calculate the force exerted by the brakes on the motor car it its mass along with passenger is 800 kg
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Force=mass*acceleration
f=m×
t
v−u
f=1000×
4
0−108×
18
5
=1000×(−7.5)
∴f=−7500N
opposing force is denoted by negative sign.
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