Question

how to solve this question

Answer 1

Since we need the horizontal component of the velocity of ball.
u= -10sin60°, v= 10sin60°,t=0.2
Finding a,
v= u+at
10sin60° +10sin60°=a(0.2)
(10√3)/0.2=a
a=50√3

F=ma
=3 x 50√3
=150√3