Hi I just wondered if what i have done is correct. before i carry on doing these questions.

1. A vehicle, moving along a straight horizontal road , has velocity v m/s at time t seconds modelled by

a) write down the times at which the vehicle is stationary

b) calculate the distance travelled by the vehicle between t=0 and t=60

c) i) Find, in terms of t, an expression for the acceleration of the vehicle at time t seconds

ii) Find the greatest speed of the vehicle

a) vehicle startionary at t=0 and t=60

b)

=

=

=600m

c)

greatest speed when a = 0

2t = 60

t = 30s

when t=30