Posted by Fatima on Wednesday, February 13, 2013 at 5:13pm.
V = Vo + a t
X = Vo*t + (a/2) t^2 (distance travelled at time t)
Vo is the initial velocity and a is the acceleration.
Velocity at t = 10.5 s = 69/3 = 23 m/s
Velocity at t = 3 s = 246/6 = 41 m/s
Acceleration = (23 - 41)/7.5 = -2.4 m/s^2
41 = Vo + 3a = Vo - 7.2
Vo = 48.2 m/s
Total distance travelled at t = 12 s
= 48.2*12 - 1.2*144 = 405.6 m
thanks alot
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