Consider an elastic collision between two particles with unequal masses (m m2) where the second particle is initially at rest. Show that the angle between the two outgoing velocities satisfies θ < π/2 if m1 > m2, but θ >π/2 if m1 < m2.

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be