A ball is dropped from a height of 20 m. At the same instant another ball is thrown up from the ground with a speed of 20 m/s. When and where will theballs meet?

A ball is dropped from a height of 20 m. At the same instant another b

1.	A ball is dropped from a height of 20 m. At the same instant another ball is thrown up from the ground with a speed of 20 m/s. When and where will theballs meet?
Answer» Choose a FRAME of reference in which the ball thrown upwards is stationary. In other words IMAGINE what it wouldlook like if you were observing from a point on the upward travelling ball. At the START you would be stationary, you would SEE the other ball INITIALLY moving towards you at 20m/s and it would accelerate at g. Use the equations of uniformly accelerated motion (suvat) to find the time it takes for a collision. (s=ut + 1/2 at^2) In this time the upward travelling ball will have covered a distance given by: dist =speed x time =20 x t. This is how far from the floor the collision takes place.Explanation:

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A ball is dropped from a height of 20 m. At the same instant another ball is thrown up from the ground with a speed of 20 m/s. When and where will theballs meet?​

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A ball is dropped from a height of 20 m. At the same instant another ball is thrown up from the ground with a speed of 20 m/s. When and where will theballs meet?