1. V = Vo + a*t.
15 = 0 + a*5 a = 3 m/s^2.
2. V = Vo + a*t.
0 = 15 - 5*t, t = 3 s.
3. d1 = Vo*t + 0.5a*t^2.
Vo = 0, t = 5, a = 3 m/s^2, d1 = ?.
d2 = Vo*t. Vo = 15 m/s, t = 15 s,
d2 = ?.
V^2 = Vo^2 + 2a*d3.
V = 0, Vo = 15 m/s, a = -5 m/s^2, d3 = ?.
d1+d2+d3 = Total dist.
A vehicle of mass 1200 kg accelerates uniformly from rest to a velocity of
15 m/s in 5 seconds. It continues at this velocity for 15 seconds before decelerating uniformly at a rate of 5m/s2 to rest.
Determine the following:
(i)The acceleration
(ii)The time taken to decelerate from 15 m/s to rest
(iii)The total distance travelled
1 answer
1 answer