Question

Please Help. A 5 kg object is propelled from rest at time t=0 by a net force F that always acts in the same direction. The magnitude of F in newtons is given as a function of t in seconds by F= 0.5t. What is the speed of the object at t =4s?

Answer 1

F=ma
.5t=m a

v= ds/dt
a= dv/dt

v= int a dt= int F/mass dt= INT .5t/m dt

v= 1/4 4^2/m=4/5 m/s check that.

Answer 2

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