A car of mass 1000kg travelling at 30 m/s stop after a distance of 50m decelerating uniformly. What is the force exerted by it on the brakes? What is the work done by the brakes? (it's physics question)
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Answer:
Step-by-step explanation:
mass= 1000
initial velocity= u= 30
final velocity= v= 0
distance= s= 50
as we know
v²= u²+ 2as
0²= 30² + 2 a 50
-900= 100a
a= -9
And F= ma
F= 1000 x -9
F= -9000N
W= Fs
W= -9000 x 50
= -450 KJ
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