Answer to Question #283111 in Mechanics | Relativity for Vîäññé

Question

A train starts from rest and travel with uniform acceleration 0.5ms-2 for 20 secs. It then moved with the velocity it has acquired for another 30secs. The brakes are then applied and it decelerate to rest in further 10 secs. Draw the velocity time graph of the motion of the train.Using the graph, determine the retardation as the train is being brought to rest.

Determine the total distance covered by the train.

Answer 1

$v_2=a_1t=0.5\cdot20=10$ m/s

retardation:

$a_2=-v_2/10=-1$ m/s²