A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from th...
Question
A ball of mass 0.1kg 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(take g = 10ms-2)Options
A) 5 J
B) 10 J
C) 15 J
D) 20 J
Related Lesson: Vertical Projectile Motion | One-Dimensional Motion
The correct answer is C.
Explanation:
Height h = 1/2 (U2/g) = 102/20 = 5m
Energy before hitting ground is = P.E at the height of 15m.
P.E = mgh = 0.1 x 10 x 15 = 15 J
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Height h = 1/2 (U2/g) = 102/20 = 5m
Energy before hitting ground is = P.E at the height of 15m.
P.E = mgh = 0.1 x 10 x 15 = 15 J