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A level Mechanics Help!

Two tennis balls are thrown vertically upwards from exactly the same spot at 1s intervals. Each tennis ball has initial speed 30 m/s and acceleration 10m/s^2 downwards. How high above the ground do they collide?

The answer is 43.75.
How do you solve this?
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Original post by raghadgamil
Two tennis balls are thrown vertically upwards from exactly the same spot at 1s intervals. Each tennis ball has initial speed 30 m/s and acceleration 10m/s^2 downwards. How high above the ground do they collide?

The answer is 43.75.
How do you solve this?

Have you tried writing down what you know about the suvats motion. Fairly obv youre going to end up with solving two simultaneous equations if you model the motion of each ball seperately.

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