a car weighs 100kg and travelling 30m/s and stops at adistance of 50m deacclerelating uniformly.What is the force exerted by brakes and what is the work done

Asked by  | 26th Nov, 2012, 10:12: PM

Expert Answer:

u=30m/s
v=0m/s
s=50m
v2-u2=2as
02-302=2 ax 50
-900=100a
a=-9m/s2
F = ma
 =100 x 9
=900N
W= FxS
   =900 x 50=45000J

Answered by  | 27th Nov, 2012, 05:20: PM

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