Question

plzz solve this question this question is important for me please help me

Answer 1

When two boys are applying the force then the net force on the block is zero because it is moving at a constant velocity.

Now, when the three boys are applying the force, the block is accelerating at 0.2 m/s^2

Hence, the third person's force is accelerating the block.

$F_3 = F_n_e_t = mass \times acceleration$

$F_3 = 20 \times 0.2$

$F_3 = 4$ N

Now,

$F_1 = F_2 = F_3 = 4$ Newtons

Hence, each boy will apply 4 Newtons force.