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PHYSICS

JAMB 2008 - Question 11

Physics 2008 JAMB Past Questions - Question 11: If a body of mass 5kg is thrown vertically upwards with velocity u,at what height wn the potential energy equal to the kinetic energy ?

Choose the correct answers from the options given.

If a body of mass 5kg is thrown vertically upwards with velocity u,at what height wn the potential energy equal to the kinetic energy ?

A: h=u²/g

B: h=u²/4g

C: h=2u²/g

D: h=u²/2g

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Correct Answer

Explanation

From V2 = U2 + 2as
O = U 2 - 2gH, since at maximum height H, the final velocity, v = O.

when K.E = P.E
∴ H = (U)2/2g
Halfway is the height / 2

PE = KE at (1)/2 H = (U)2 /2g x (1/2) = U2 / 4g