A boy can swim in a river along the flow with a velocity 5m/s and against the flow 2m/s calculate the velocity of river flow.

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If a ball is thrown in to the air with a velocity of ,its height (in feet) after seconds is given by.find the velocity when .

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If a rock is thrown upward on the planet mars with a velocity of ,its height (in meters) after seconds is given by .

1. Find the velocity of the rock after one second.

2. Find the velocity of the rock when .

3. When will the rock hit the surface?

4. With what velocity will the rock hit the surface?

A drone is flying with velocity by Josh at time . At , is the drone moving forward, backward or neither? Show this using the velocity time graph.