A car advertisement states that a certain car can accelerate from rest to 15 m/s in 7 seconds. Find the car's average acceleration. *

Average acceleration = 2.14 m/s²

Explanation:

Average acceleration is the rate at which velocity changes. Average acceleration is the change in velocity divided by an elapsed time. For instance, if the velocity of a marble increases from 0 to 60 cm/s in 3 seconds, its average acceleration would be 20 cm/s/s.

0 - 15 m/s in 7 seconds

= (0 - 15) ÷ 7 s

= 15m/s ÷ 7 s

= 2.142 round off to nearest hundredths 2.14 m/s²

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.