A force of 6N acts horizontally on a stationary mass of 2kg for 4s. The kinetic energy gained by the mass is _________
-
A.
366j -
B.
240j -
C.
144j -
D.
90j
Correct Answer: Option C
Explanation
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 ((frac{6 times 4}{2})^2 = 12^2 = 144J) |
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