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  4. An object of mass 500g, initially at rest acted upon by a variable force where X component varies with X in the manner shown. The velocities of the object at point X = 8 m and X =12 m, would be the respective values of (nearly)

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Q. An object of mass 500g, initially at rest acted upon by a variable force where X component varies with X in the manner shown. The velocities of the object at point X = 8 m and X =12 m, would be the respective values of (nearly)Physics Question Image

NEETNEET 2019Work, Energy and Power

Solution:

$W = \Delta KE$
At $ x = 8 : 130 = \frac{1}{2}(\frac{1}{2}) v^2$
$\Rightarrow v = 2\sqrt{130} = 22.8\,ms^{-1}$
For $x = 12 : v = 20.6 \,ms^{-1}$