A Tesla Model S (with a mass of 2.2 x 103 kg) can accelerate from rest to 60 mph (27 m/s) on a horizontal track in 2.4 seconds.

a. Calculate the KEf

b. Calculate its power in Watts and in horsepower (1.0 hp = 745 W)

See the answers below.

Explanation:

a) KEf, This term refers to the final kinetic energy i.e. when the velocity has reached 27 [m/s].

To calculate this energy we must use the following equation that relates velocity and mass to kinetic energy.

where:

m = mass = 2.2*10³[kg]

v = velocity = 27 [m/s]

b)

Power is defined as the amount of energy or work done over a certain time, it can be calculated by means of the following equation.

where:

t = time = 2.4 [s]

P = Power [W]

Now replacing: