A train starting from rest first accelerates uniformly up to a speed of 80 km / h for time t , then it moves with a constant speed for time 3 t . The average speed of the train for this duration of jo

Question

A train starting from rest first accelerates uniformly up to a speed of 80 km / h for time t , then it moves with a constant speed for time 3 t . The average speed of the train for this duration of journey will be (in km / h ) :

TestHub · Accepted Answer

Average speed ​ = time taken total distance ​ = 4 t 2 80 × t ​ + 80 × 3 t ​ = 70 km / hr . ​

Physics - Kinematics Question with Solution | TestHub

Options:

Doubts & Discussion