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30. How high must a body be lifted to gain an amount ofpotential energy equal to kinetie energy it has, whenmoving at speed 20 mrt?ICBSE 1997) IAns. 20.4 ml

Answer»

GIVEN::

K.E = P.E =>1/2MV​²=MGH

=>H=1/2V²/g

PUTTING VALUES

H=1/2*20*20/9.8

= 20.4m



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