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Q.

When a body is projected vertically up, its PE is twice its KE, when it is at a height h above the ground. At what height will its KE be twice the KE?

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a

h4

b

h2

c

h3

d

2 h

answer is C.

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Detailed Solution

Total energy, E1 = PE + KE

=PE+12PE=32PE=32mgh

E2=PE+KE=PE+2PE+3PE = 3mgh

 As, E2=E1⇒3mgh′=32mgh⇒h′ = h2

 

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