An object of mass 0.25kg moves at a height h above the ground with a speed of 4ms-1, if its mechanical energy at this height is 12 J, determine the value of h. [g = 10ms-1]
-
A.
0.8m -
B.
4.0m -
C.
4.8m -
D.
5.6m
Correct Answer: Option C
Explanation
h = (frac{PE}{mg} – frac{12}{0.25 times 10} = 4.8m)