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JAMB Physics 2019 Paper
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© africaexams.com
Question : 37
Total: 100
A force of 6N acts horizontally on a stationary mass of 2kg for 4s. The kinetic energy gained by the mass is _________
366j
240j
144j
90j
Validate
Solution:
F = 6N, m = 2kg, t = 4s, u = 0 (stationary or at rest)
K.E
=
1
2
mv
2
F
=
mv
t
from rest
K.E
=
1
2
m(
Ft
m
)
2
=
1
2
×
2 x (
6
×
4
2
)
2
=
12
2
=
144
J
© africaexams.com
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