d = (1/2) a t^2
8 = .5 a (16)
so a = 1 m/s^2
v = a t = 1 (4) = 4 m/s
or use head like this
average speed = 8 m/4s = 2 m/s
begin speed is zero
so final speed = twice average speed = 2*2 = 4 m/s
A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s.
PLEASE explain :)
1 answer
1 answer