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The distance of the point (9, -12) from ...

The distance of the point (9, -12) from origin will be ___________
a) 13
b) 15
c) 14
d) 17

Text Solution

Verified by Experts

The correct Answer is:
A, B
A sphere having mass m roll on a plane surface. Let its radius be R. Its centre moves with a velocity . Therefore
Kinetic energy `=1/2Iomega^2+1/2mv^2`
`=1/2xx(2/5mR^2)xxv^2/R^2+1/2mv^2`
`=2/10mv^2+1/2mv^2`
`((2+5)mv^2)/10=7/10mv^2`
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