$1$

Mark for Review

At time $t_1,$ a car is traveling to the west with speed $v.$ At time $t_2,$ the car is traveling to the east with speed $v$ Which of the following correctly indicates the change in the kinetic energy $K$ of the car between times $t_1$ and $t_2,$ and provides a valid justification?

A $K=0,$ because the mass and the speed of the car are the same at $t_1$ and $t_2.$

$($B$)K=0,$ because the kinetic energy of the car is constant between $t_1$ and $t_2.$

$K>0,$ because the kinetic energy changes from negative to positive.

$K>0,$ because the velocity of the car changes direction.

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