# Projectile motion related numerical

1. Jun 2, 2009

### shahzadzai

Question

a stone is thrown vertically upwards. if it takes 30 seconds to return to the ground, How high does the stone go?..

I need asap solution

2. Jun 2, 2009

### fatra2

Hi there,

Come on. I believe you can answer that by yourself. You just need to apply the accelerated linear motion equations and you get to your answer

3. Jun 2, 2009

### shahzadzai

can u provide that linear accelerated motion...

4. Jun 2, 2009

### fatra2

Not really, but I can help you find them.

Acceleration is define as a variation of speed: $$a = \frac{v_1 - v_0}{t}$$

In the case of accelerated linear motion, the average speed is equal to the mean speed: $$\overline{v} = \frac{v_0 + v_1}{2}$$

From these three equations, you have the solution to your question.

5. Jun 2, 2009

### tiny-tim

Hi shahzadzai!

They are the standard constant acceleration equations … see the PF Library.

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