Question

1) an object starts from rest with a constant acceleration of 8.00 m/s^2 along a straight line. find;
a) the speed at the end of 5s.
b) the average speed for the 5s interval.

2) a truck's speed increase uniformly from 15 km/h to 60 km/h in 20 s. determine :
a)the average speed.
b) the acceleration.
( all in units of meters and seconds)