$5$

Mark for Review

At time $t_1,$ a cart with mass $m$ being pushed on a straight, level track has speed $v.$ A short time later at $t_2,$ the cart has speed $3v.$ Which of the following expressions is equal to the average power delivered to the cart between time $t_1$ and $t_2?$

$4m{v}^2$

$\frac{9}{2}m{v}^2$

Classroom

Question $5$ of $18$