Question

A snowmobile travels in a straight line.The snow-mobile’s initial velocity is +3.0 m/s.

Answer 1

A) 7 x 0.5 = 3.5 +3.0 = 6.5 m/s

B) 3/.6 = 5, it will take 5 seconds to stop

Answer 2

$v_{f}=v_{i}+at$
$v_{f}=3.0m/s+(0.50m/s^{2})(7.0s)$
$v_{f}=3+3.5=6.5m/s$

$v_{f}=v_{i}+at$
$t=\frac{v_{f}-v_{i}}{a}$
$t=\frac{0-3}{-0.6}$
$t=5sec$