- #1

ankit arya

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**kinematics ... rock thrown up in air**

## Homework Statement

If a rock is thrown upward on the planet Mars with a velocity of 22 m/s, its height (in meters) after t seconds is given by H = 22t - 1.86t^2.

Find the velocity of the rock when t = a.

When will the rock hit the surface?

With what velocity will the rock hit the surface?

## Homework Equations

v=u+at

## The Attempt at a Solution

i found the ans for first two ques but i am not able to solve the third one.

velocity at t=a is 22-3.72a

rock will hit the surface at t=11.83s

pls help me with the third one...