# Projectiles on an Incline

1. Apr 29, 2012

### ebmaj7

1. The problem statement, all variables and given/known data

Part (a) was fine, managed it okay.

2. Relevant equations

$v_x = 20\cos30 -9.8\sin35 = 3.32$

$v_y = 20\sin30 -9.8\cos35 = -10$

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

3. The attempt at a solution

$\dfrac{4}{5} = \dfrac{v_b - v_a}{u_a - u_b}$

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

The plane isn't moving. So if the plane was object 'b' then vb and ub 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.