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How high must the body be lifted to gain an amount of potential energy equal to the kinetic energy it has when moving at a speed of 20m/s? g=9.8m/s^2

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How high must the body be lifted to gain an amount of potential energy equal to the kinetic energy it has when moving at a speed of 20m/s? g=9.8m/s^2

(a) 20m

(b) 20.0m

(c) 202m

(d) 22m

This question was posed to me in my homework.

This intriguing question comes from Collision and Friction in division Nature of Physical World of Engineering Physics I

1 Answer

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Best answer
Right choice is (b) 20.0m

The explanation: mgh = 1/2mv^2

h = v^2/2g = 20.2m.

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