# scince

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During a rain storm, rain comes straight down with velocity Vi =-15 m/s and hits the roof of a car perpendicularly. The mass of the rain per second that strikes the roof is 0.060 kg every second. Assuming that the rain comes to rest upon strikingthe car ( Vf = 0 m/s), find the average force exerted by rain on the roof during a 3 second time interval.

• Physical Science/Physics -

F=Ma

F=M(∆V/t)

∆V=Vf-Vi=-15m/s-0m/s=-15m/s
t=3s
m=0.060 kg

Plug and chug

F=(0.060 kg)[(-15m/s)/3s]

• scince -

The time interval doesn't matter.

F = (0.060 kg/s)(15 m/s) = 0.90 N

• scince -

I think that it would: F=ma, and F=mdV

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