if a train is going this fast Towards a stand still ball how fast when the train hit a ball

Classical Mechanics Level 1

If a train is going 200 km/h towards a ball on a stand still podium when The train hits the ball how fast will it the ball go in the other derection

Same as 200km/h More than 200km/h Less than 200km/h

Konner Sherman-Morgan by Konner Sherman-Morgan , 15, USA

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2 solutions

Tristan Goodman
Dec 4, 2019

In an ideal situation in which the collision is perfectly elastic and the ball has negligible mass compared to the train, the ball will be projected in the direction of the train with twice the velocity of the train.

This can be visualized by imagining an inertial frame in which the front of the train is stationary and the ball is traveling towards the train at 200 km/h before bouncing off the front of the train and going back in the opposite direction at 200 km/h relative to the train, making its speed 400 km/h relative to ground.

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The author needs to clearly state what the velocity is with respect to. He does not, nor does he mention any energy constraints. In any real collision ( finite train mass, and elastic ) the ball will be moving less than 200 km/hr with respect to the train.

Eric Roberts - 1 year, 6 months ago

It will be more than 200km/h because when the train hits the ball it will send it’s kinetic energy into the ball there for sending it away at a speed at witch is higher that’s the tergectory of the train

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