Q. 13

# A van of mass 150

Given:

Mass of van=1500kg

Speed=15m/s

Time taken to stop=10s

Formula used:

Mechanical energy=kinetic energi=1/2mv2

M=mass

V=velocity

So

Kinetic energy=1/2× 1500×225=168750J

Average rate of production of thermal energi=energy produced /time

=168750/10 J/s

=4017.8 cal/s

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