# Need help!!!?

PE = mgh KE = 0.5mv2

(10pts): A toy car rolled off a ramp that was 2.5m high.What was the car’s velocity when it exited the ramp?

### 1 Answer

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- ?Lv 72 months ago
kinetic energy = potential energy

(1/2)mv² = mgh

Cancel m

(1/2)v² = gh

multiply both sides by 2

v² = 2gh

Plug in g = 9.8 and h = 2.5

v² = (2)(9.8)(2.5)

v² = 49

Take the square root of both sides

v = 7 m/s <––––

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