1.

When a car moving with 180 km/h velocity,becomes stationary in 5 s, its average retardationms-2

Answer»

V = u+at , u = 180km/h = 180*5/18 = 50m/s

when car stops at t = 5 sec , then v = 0

so, 0 = 50 +a*5

=> a = -50/5 = -10 m/s²

avg retardation = 10m/s²

thanks



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