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PHYSICS

JAMB 2020 - Question 3

Physics 2020 JAMB Past Questions - Question 3: A ball of mass 0.1 kg is thrown vertically upwards with a speed of 10ms-¹ from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is

Choose the correct answers from the options given.

A ball of mass 0.1 kg is thrown vertically upwards with a speed of 10ms-¹ from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is

A: 5J

B: 10J

C: 15J

D: 20J

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Correct Answer

Explanation

Distance travelled up = v² -u²/ 2g = 10² - 0²/2 X 10 = 5m ; Total height = 5+ 10 = 15m Total energy = mgh = 0.1 x 10 x 15 = 15J