Question

PROBLEM    03 – 0328:    A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. if the hand moves 0.2m while applying the force and the ball goes up to 2m height further find the magnitude of the force. (Consider g = 10 ms–1)
(A) 16 N             (B) 20 N
 (C) 22 N                (D) 4 N

Answer 1

F=mgh
=0.2×10×2
=4N
so the answer is 4N

Answer 2

Heya❤❤

Ur answer is: option (c) 22N //this is enough for 1 Mark or for mcq

Explanation::

The work/energy input to the system is

W=E=(F−mg)δ

This energy is completely transformed into potential energy so

(F−mg)δ=mgh

with

F=mg(1+hδ)

here

δ=0.2 [m]

m=0.2 [K]

h=2 [m]

then

F=0.2⋅10(1+20.2)=22 [N]

hope it helps

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