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## Homework Statement

A ball of mass 350g is travelling with a speed of 4m/s when it hits at right angles a fixed vertical wall. The ball rebounds with a speed of 3m/s. Find the magnitude of the impulse exerted by the ball on the wall. Using a simple diagram show the direction of velocities and the impulse.

## Homework Equations

m = 350g or m = 0.35kg v1 = - 4m/s^-1 v2 = 3m/s^-1

Magnitude = mv2 – mv1

## The Attempt at a Solution

Magnitude = 0.35 3 – 0.35(- 4)

Magnitude = 1.05 – 1.4

Magnitude = - 0.35

Hi can some one check this equation for me please.

Also is there a unit to simbolize magnitude? and is the final answer 0.35 given in joules???

Last one how would i draw a simple diagram showing the direction of velocities and the impulse???

thank you