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Velocity Displacement Relationship

A train start...

Question

A train starting from rest attains a maximum speed of 54 km/h in 30 sec with uniform acceleration, it then travels with this speed for 40 sec. and is then bought to rest in further 30 sec with uniform retardation , calculate the total distance travelled.

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Q. A train accelerating uniformly from rest attains a maximum speed of 40 m/s in 20 sec. It travels at this speed for 20 sec, and is brought to rest with uniform retardation in 40 sec. The average velocity during this period is

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