Two cars on a straight road at time zero are beside each other. the first car, traveling

I believe this problem ask to express the velocity of the first car and second car in terms of t.

The general expression for the velocity is given as:

v = v0 + a t

where v is the velocity, v0 is the initial velocity, a is acceleration, t is time

a. velocity equation for the first car

v = 30 – 6 t

b. velocity equation for the second car

v = 24 – 6 t

We can see that the acceleration is negative because both cars are slowing down (deceleration).

3.  When energy is used, it can transform to new types but can never disappear.

Explanation: it can transform into heat, light, ect and will never disapear unlessed turned of.