- #1
BilloRani2012
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Homework Statement
A car weighing m kg, and a truck, weighing 4m kg, collide at an angle of alpha. Initially they are traveling at the same velocity. After the collision they move off together at an angle of theta.
a) show that tan(theta) = (4 sin alpha) / (4 cos alpha + 1)
b) Show that if their initial velocity is u the velcoity that they move off at is
v = u/5 squareroot of (17+8 cos alpha)
c) Find the velocity and direction they move off at if alpha = pi/2. What value of alpha gives the minimum velocity?
Homework Equations
The Attempt at a Solution
Ive done a) and b). BUT for part c) do i just sub alpha=pi/2 into the equation to find v. But the u is unknown too...so what do i do?