Question #102548

25lb brick falls 4ft what is the force of impact?

Expert's answer

**Solution. **According to the conditions of the problem m=11.3398kg and h=1.2192m. Using the law of conservation of mechanical energy for the initial and final positions, we write

Hence velocity at the time of impact is

where h is height; g=9.8 m/s^2 is gravitaty acceleration.

On the other hand, using the law of conservation of momentum, we obtain

where ∆v is velocity change; F is force of impact; t is impact time. The equations of motion of a brick can be written

Сombining the equations we get

"F=11.3398\\times 9.8\\approx 111.13N"

**Answer.** 111.13N

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