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Physsics - Modern Physics

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A ball is thrown vertically upwards with an initial speed of 40m/s

a) What is the value of the instantaneous speed and the acceleration when the ball reaches its maximum height?

b) How long does it take to reach this height?

c) How long does it take the ball to fall from the maximum height to the original height?

d) How long does it take for the ball to reach a speed of 20m/s going downwards?

e) What is the velocity of the ball when it returns to its original height?

Thank you.

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Solution Summary

The expert examines the modern physics to reach the height. A complete, neat and step-by-step solution is provided.

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Let s(t) be the height to which the ball reaches t seconds after it is launched.

Then, we have s(t) = -4.9t^2 + 40t

The velocity of the ball at any instant t after launch is given by s'(t) = -9.8t + 40 and its ...

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