Question

5. The mass of a body is 2.5 kg. It is in motion and its velocity v after time t is v = t^3/3 + t^2/2+1. Calculate the force acting on the body at the time t=3 second.

Answer 1

force=mass× acceleration
acceleration=dv/dt
t^2+t
at t=3sec acceleration= 9+3=12m/sec^2
force=2.5×12=30N