A body of mass 2kg moving vertically upwards has its velocity increased uniformly from 10ms-1 to 40ms-1 in 4s. Neglecting air resistance, calculate the upward vertical force acting on the body.[g = 10 ms-1]
-
A.
15N -
B.
20N -
C.
35N -
D.
45N
Correct Answer: Option C
Explanation
F = mg + ma
F = 2 [10 + (frac{(40 – 10)}{4})]
F = 35 N