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JAMB Physics 2021 Paper
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© africaexams.com
Question : 22
Total: 40
A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms
−
1
^{-1}
−
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
^{-2}
−
2
)
5J
10J
15J
20J
Validate
Solution:
Givn
m = 0.1kg
u = 10ms
−
1
^{-1}
−
1
h = 10m
g = 10ms
−
2
^{-2}
−
2
At h
max
_{\text{max}}
max
; v = 0
Using
¬
v
\neg v
¬
v
=
¬
u
\neg u
¬
u
=
¬
gt
\neg \text{gt}
¬
gt
¬
0
\neg 0
¬0
=
¬
w
\neg w
¬
w
-
¬
10
t
\neg 10t
¬10
t
v
2
^{2}
2
= u
2
^{2}
2
- 2gh
0
2
^{2}
2
= 10
2
^{2}
2
- 2 x 10h
20h = 100
h = 5m
Total height = 10 + 5
= 15m
Total energy = mghr = 0.1 x 10 x1 5
= 15J
© africaexams.com
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