calculate the potential energy of an object of mass 30 kg and being lifted up by 5 m. if this object is allowed to fall, find the kinetic energy just before it touches the ground.

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Solution

Dear Student ,
$P o t e n t i a l e n e r g y = m g h = 30 \times 10 \times 5 = 1500 J I f t h e o b j e c t i s a l l o w e d t o f a l l t h e n t h e k i n e t i c e n e r g y j u s t b e f o r e i t t o u c h e t h e g r o u n d i s, E = \frac{1}{2} m v^{2} = m g h = 1500 J A s t h e p o t e n t i a l e n e r g y i s t o t a l l y c o n v e r t e d i n t o t h e k i n e t i c e n e r g y w h e n t h e b o d y / o b j e c t i s a b o u t t o t o u c h t h e g r o u n d .$

Regards

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