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The mass of cyclist together with the bi...

The mass of cyclist together with the bike is 90 kg. Calculate the increse in kinetic energy if the speed increses from 6.0 km/h to 12 km/h.

Text Solution

Verified by Experts

The correct Answer is:
C
`M=m_c+m_b=90m`
`u=6km/h=1.666m/sec`
`v=12 km/h=3.333 m/sec`

increse in K.E. =1/2Mv^2-1/2mu^2`
`=1/2 90xx(3.333)^2-1/2xx90x(1.66)^2`
=499.4-124.6`
`=374.8=375J`
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