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total mass m =64+86=150kg
initial velocity u =36kmh=36x1000/60x60=10m/s
final velocity V =18km/h=18x1000/60x60=5m/s
using V^2-u^2=2aS
aS =25-100/2
aS=-75/2=-37.5
work done W =FxScos 0
W=maxS [ F =ma]
W =150x-37.5
W=-5625 joules [ since it is a negative work done, I.e,by applying brake ]
initial velocity u =36kmh=36x1000/60x60=10m/s
final velocity V =18km/h=18x1000/60x60=5m/s
using V^2-u^2=2aS
aS =25-100/2
aS=-75/2=-37.5
work done W =FxScos 0
W=maxS [ F =ma]
W =150x-37.5
W=-5625 joules [ since it is a negative work done, I.e,by applying brake ]
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