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## Homework Statement

Part (a) was fine, managed it okay.

## Homework Equations

[itex]v_x = 20\cos30 -9.8\sin35 = 3.32[/itex]

[itex]v_y = 20\sin30 -9.8\cos35 = -10[/itex]

Part (b) is what is giving me trouble at the moment.

## The Attempt at a Solution

[itex]\dfrac{4}{5} = \dfrac{v_b - v_a}{u_a - u_b}[/itex]

I really don't know where to go from here.

The plane isn't moving. So if the plane was object 'b' then v

_{b}and u

_{b}would both be 0.

The speed at which the projectile strikes point A (the final velocity) = the initial velocity after the collision has taken place.

You could then solve to find the velocity of the projectile after the collision.

Revising for my Mechanics 3 A level exam, AQA.