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

Answer:

twice as much

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

Answer:

c) Twice as much

Explanation:

As we know that kinetic energy is given by the formula

$K = \frac{1}{2}mv^2$

here we know that

m = mass of the object

v = speed of the object

so here we will have kinetic energy of Car A

$K = \frac{1}{2}(1000)(60^2)$

$K_a = 1.8 \times 10^6$

now we have kinetic energy of B is given as

$K_b = \frac{1}{2}(2000)(30^2)$

$K_b = 0.9 \times 10^6$

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