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## Homework Statement

**A ball of mass 0.5 kg travelling horizontally through the air with speed v(t) experiences**

a drag force DT (t) whose magnitude is given by:

D

The speed of the ball is found to reduce from 10 m/s to 8 m/s over a time interval t,

during which time the ball continues to travel horizontally. Calculate t.

a drag force DT (t) whose magnitude is given by:

D

_{T}(t ) = 0.01[v (t )]^{2}The speed of the ball is found to reduce from 10 m/s to 8 m/s over a time interval t,

during which time the ball continues to travel horizontally. Calculate t.

## Homework Equations

I'm not entirely sure where to start with this. My notes give me the equation for drag forces falling vertically but I wasn't sure what to do because it's travelling horizontally.