556PhysicsMedium
A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes up to 2 in height further, find the magnitude of the force. Consider g = 10m/s 2
A22N
B20N
C4N
D16N
Correct answer
A. 22N
Explanation
Mass ,m=0.2kg Total height, h=0.2+2=2.2m Work done =Difference in potential energy. F.S=mgh where S is the distance for e hich the force is applied by hand, S=0.2m F= S mgh = 0.2 0.2×10×2.2 F=22N