A man moves on his bike with 54km/h and takes u- tune (180 degree)and continues it speed to move with same speed .the time of u-tune is 10sec.find its average accleration

Question

A man moves on his bike with 54km/h  and takes u- tune (180 degree)and continues it speed  to move with same speed .the time of u-tune is 10sec.find its average accleration

Henry · Answer

r = 54km/h = 54000m/3600s = 15m/s. a = (V-Vo)/t = (-15-15)/10 = -30/10=-3.0 m/s^2.