A car mass 1000 kg travelling at 30m/s stops after a distance 50m, decelerating uniformly. what is the force exerted by it on brakes? what is the work done by the brakes?
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Answer:
-450 KJ
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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