Question

Calculate the work required to be done to stop a car 1500kg moving with velocity of 60m/h

Answer 1

Hii There!!!

Given ,

m=1500kg

 u= 60 km / h => 60 × 5/18 = 50/3m/s 

v =0m/s  ( its final velocity will be zero )

Since , W = Kf - Ki

KE = 1 / 2 mv² 

W = 1 /2mv2  - 1/2 mu2  

=> 1/2m(v2-u2)

 => 1/2 × 15000 [ 0- (50/3)2 ]

=  -208333.33 Joules


Hence, required workdone = -208333.33 J


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Hope it helps