(b) A train is moving with a speed of 90 km/hr on a straight line track. The driver applies brakes and uniformly reduces its speed from 90 km /hr to 60 km/hr in 2 minutes. Calculate the average velocity of the train during this uniformly retarded motion.
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90+60=150 km per /hr
150 km per hr /2min=75mins
the average velocity if the bus during that period = 75 km per hour
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