a motor car accelerate for 10sec to attain a velocity for 20msec it comtinue with uniform velocity for a further 20sec and then disccelerate so that it stop in 20sec,calculate.(1)acceleration,(2)deceleration

Answer 1

1. V = a * t = 20 m/s.
a * 10 = 20
a = 2 m/s^2.

2. V = Vo + a*t = 0
20 + a*20 = 0
20a = -20
a = -1.0 m/s^2.