A ball hits a wall straight on at 5 m/s and bounces straight back at 5 m/s. A student says: the speed did not change, so the change in velocity is zero. What is wrong with this?

PhysicsMediumHigh School (11–12)Mechanics › Vectors and Motion in a Plane

A ball hits a wall straight on at $5\ \text{m/s}$ and bounces straight back at $5\ \text{m/s}$ . A student says: the speed did not change, so the change in velocity is zero. What is wrong with this?

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