A ball of mass 0.1kg is thrown vertically upwards with a ...
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)
5J
10J
15J
20J
Correct answer is C
m = 0.1kg
u = 10ms−1
h = 10m
g = 10ms−2
At hmax; v = 0
Using
v̸ = u̸ = g̸t
⧸0 = w̸ - ⧸10t
v2 = u2 - 2gh
02 = 102 - 2 x 10h
20h = 100
h = 5m
Total height = 10 + 5
= 15m
Total energy = mghr = 0.1 x 10 x1 5
= 15J
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