Q$4$: semi$-$elastic

Two hovercraft are on a collision course. They both have the same mass $($m$)$ and they are

approaching the crash point at speeds of $1\mathrm{.}0$m$/$s and $2\mathrm{.}0$m$/$s respectively. They bump and

rebound. The $1$st hovercraft has a post$-$crash speed of $1\mathrm{.}5$m$/$s directed away from the crash $($to the

left$).$ What is the final velocity of the second craft?

$1\mathrm{.}0$m$/$s$$ before $2\mathrm{.}0$m$/$s

$1\mathrm{.}5$m$/$s$$ after $????.$

Q$5$: Inelastic

A comet of mass $3\mathrm{.}10$x$103$kg and velocity $+501$m$/$s ploughs into a stationary asteroid of

mass $7\mathrm{.}95$x$104$kg where it buries itself in the cratered surface. What is the velocity of the

asteroid$/$comet combination after the incident?