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Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.MiscellaneousMedium2 minPYQ_2015

PhysicsMediumsingle choice

A ball is thrown vertically downwards from a height of $20 m$ with an initial velocity $v_{0}$ . It collides with the ground, loses $50$ percent of its energy in collision and rebounds to the same height. The initial velocity $v_{0}$ is: (Take $g = 10 m s^{- 2}$ )NEET 2015 (Phase 2)

Options:

Answer:

Solution:

kinetic energy of the ball on reaching ground

$K E_{1} = m g h + \frac{1}{2} m v_{0}^{2}$

after collision $\frac{K E_{1}}{2} = m g h$

$\frac{m g h + \frac{1}{2} m v_{0}^{2}}{2} = m g h$

$v_{0} = \sqrt{2 g h} = 20 m s^{- 1}$

Stream:NEETSubject:PhysicsTopic:W.E.P.Subtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2015

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