Question

answer forthwith plzz​

Answer 1

Answer:20 m

Explanation:

See the attachment.

Answer 2

Answer:

We have, S = ut + (1/2)*at^2...............(1)

Given:. X=3t+t^3

=t(3+t^2)..........................(2)

When t=1sec, displacement X= 3*1+1^2=4m

When t=3sec, displacement X =3(3+3^2)

=3*12=36m

Now by question,the required displacement will be +16m