An express train is moving with a velocity `v_1`. Its driver finds another train is movig on the
Channel: Doubtnut
Date: 2020-07-26

An express train is moving with a velocity `v_1`. Its driver finds another train is movig on the same track in the same direction with velocity `v_2`. To escape collision, driver applies a retardation a on the train. The minimum time of escaping collision be