Force is applied to a body of mass 2 ~kg at rest on a frictionless horizontal surface as shown in the force against time ( F - t ) graph. The speed of the body after 1 second is

Step-by-step solution

Area under the F-t graph gives change in momentum. Since the body is initially at rest, it gives the momentum of the body after 1 second. aligned & Area =10 0.5+20 0.5=5+10=15 ~N - s & mV =15 ~N - s & V = 15 ~m = 15 2 =7.5 ~m / s aligned