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**1b**here,

## Homework Statement

1. In a one-minute interval, 1000 hailstones, each of mass 0.5 g and speed 10ms-1, strike a

window pane of area 1m2 at an angle of 45°.

(a) If the collisions are elastic, calculate :

(i) the average force and

(ii) the average pressure on the window pane.

(b) How would your answer differ if, in Q1, instead of striking a window pane, the

hailstones strike soft putty and are embedded in it?

## Homework Equations

Δρ = (mv) - (-mv) = 2mv ? now it is not elastic = mv?

P = F/A = N/V (mv^2) = N/v ΔT A (mv^2) = N/ΔT (mv)

V = v ΔT A

## The Attempt at a Solution

I worked out that the average force is 0.0833N and the average pressure is 0.0833Pa. I don't think the force changes at all, but the change of momentum obviously does as there is no rebound. I'm stuck with this and am not sure how to find out how it would change in ai) and aii)

Any help is very much appreciated! Thank you