**A ****57**** g tennis ball is served at ****45**** m/s.**

**If the ball started from rest, what impulse was applied to the ball by the racket?**

**Known Variables:**

**mass(m) : **57g or .057 kg

**velocity(v) : **45 m/s

**Impulse** is force and time

**I **= F x t

We know that

**F**= ma

&

**a=**v/t

this would be derived

**F= **m (v/t)

Since we know **impulse** is force and time (**I **= F x t),

we solve for “**Ft”**

**F x t **= mv

Impulse = mv = 0.057kg x 45m/s = 2.565

**Impulse = 2.6 **kg * m.s

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