Question

a train moving with speed 72km per hour is brought to rest in 40 sec.find the retardation and distance covered.

Answer 1

initial velocity = 72km/h = 20m/s

final vel = 0

time = 40s

putting in v = u+at

a = - 0.5 m/s^2

now putting values in equation v^2 - U^2 = 2as

we got s = 400m

Answer 2

hey mate, ur answer is 400m