Question

Car A has a mass of 1,000 kg and is traveling 60 km/hr. Car B has a mass of 2,000 kg and is traveling 30 km/hr. Compare the kinetic energy of car A with that of car B?

A) equal
B) half as much
C) twice as much
D) four times as much

Answer 1

twice as much

Step-by-step explanation:

Using the formula for the amount of kinetic energy: K.E. = 1/2 m v2. You would find that car A has twice as much energy as car B.

Answer 2

c) Twice as much

Step-by-step explanation:

As we know that kinetic energy is given by the formula

`K = (1)/(2)mv^2`

here we know that

m = mass of the object

v = speed of the object

so here we will have kinetic energy of Car A

`K = (1)/(2)(1000)(60^2)`

`K_a = 1.8 * 10^6`

now we have kinetic energy of B is given as

`K_b = (1)/(2)(2000)(30^2)`

`K_b = 0.9 * 10^6`

So kinetic energy of Car A is double that of Kinetic energy of car B