# How long does it take to reach the ground?

## Homework Statement

Standing on the roof of a 66 m tall building, you throw a ball straight up with an initial speed of 12.5 m/s. If the ball misses the building on the way down, how long will it take from you threw the ball until it lands on the ground below? Give your answer in seconds and round the answer to three significant figures.

## The Attempt at a Solution

I'm not sure how to answer this. How do I know how high he throws it initially? [/B]

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You can calculate the maximum height of the ball using given initial speed.

haruspex
Homework Helper
Gold Member
You can calculate the maximum height of the ball using given initial speed.
You can, but it's just extra work here.

Lana, what equations do you know which may be relevant? Does SUVAT mean anything to you?

You can, but it's just extra work here.

Lana, what equations do you know which may be relevant? Does SUVAT mean anything to you?
You are definitely right.