# What force is exerted on the windscreen?

## Homework Statement

A car is driving through a rainstorm. Each raindrop of mass $$0.00005kg$$ hits the windscreen with velocity of $$16 ms^{-1}$$. If $$500$$ raindrops hit the glass and run down the windscreen each second without bouncing, what force is exerted on the windscreen?

## Homework Equations

Force = Mass x Acceleration

Momentum = Mass x Velocity

Inelastic Collisions:
$$m_1u_1 + m_2u_2 = (m_1+m_2)v$$

## The Attempt at a Solution

$$m = 5.0 \times 10^{-5}kg \ , \ u = 16ms^{-1}$$

don't know how to start, need help!

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The equations you gave are correct; but also remember that F = change in momentum / change in time.
Make sure you keep track of your units, and a force needs to end up being kg*m/s^2.

Can someone please explain. Still, I don't know how to start =(

mgb_phys