Question

Displacement of a block is given as function of time as S=1-4t - 2t²(m/s). The magnitude of the
net force acting on it is (if mass is 2 kg)
(A) 4N
(B) 2N
(C) 8N
(D) 6N​

Answer 1

Explanation:

ds/dt = -4 - 4t

v = -4 - 4t

dv/dt = a = -4 m/s^2

F = ma

= 2 x -4

= -8 N

= 8 N