Question

please answer this ​

Answer 1

hope it will be helpful for you

Answer 2

Explanation:

Using s=ut+0.5at^2. (to find distance)

we get 0.5×4×t^2=800. solving,we get the value of t as 20seconds. now,resubstituting value of t in first kinematics equation,.

we get v=u+at

u=0

As body starts from rest

at=4*20 which is 80m/s.

His final velocity is 80m/s.