Question

a body of mass 20 kg is moving with a velocity of 72 km/h a force is applied to the body for 25 s and it attains a velocity of144 km/h what is the force applied ?

Answer 1

we know that force is given as

F = ma = m(dv/dt)

here,

m = 20 kg

dv = 144 km/h - 72 km/h = 72 km/h = 20 m/s

dt = 25s

so,

F = 3 x (20 / 25)

thus, we get

F = 2.4 N