Question

If body start from rest and travels at an acceleratiin of 12m/s^2 for a time of 5 second calculate its final velocity

Answer 1

= 2(t-1). Acceleration= a=dv/dt .So dv/dt=2(t-1)

dv =2(t-1)dt. Integrating we get v= 2t^2/2 - 2t + constrained. Now when t= 0 v= 0 So constant. = 0 .we have then v=2 ×5^2 /2 - 10 at t= 5sec. So v= 15 answer.

Answer 2

Since body is starting from rest u=0 and v=u+a*t

Now v=a*t i.e 12*5 = 60m/s

Hope this help you