A $91\mathrm{.}0-$kg fullback running east with a speed of $4\mathrm{.}00\frac{m}{s}$ is tackled by a $93\mathrm{.}0-kg$ opponent running north with a speed of $3\mathrm{.}00\frac{m}{s}.$

$($a$)$ Explain why the successful tackle constitutes a perfectly inelastic collision.

This accessible tackle constitutes a perfectly inelastic collision because both of them moved together after the collision, and there is energy lost in the collision.

Score: $1\mathrm{.}81$ out of $1\mathrm{.}81$

Comment:

$($b$)$ Calculate the velocity of the players immediately after the tackle.

magnitude $\frac{m}{s}$

direction

north of east

$($c$)$ Determine the mechanical energy that disappears as a result of the collision.

J