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

c) Twice as much

Explanation:

As we know that kinetic energy is given by the formula

here we know that

m = mass of the object

v = speed of the object

so here we will have kinetic energy of Car A

now we have kinetic energy of B is given as

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

28. evolution

29. environment, survive, offspring  

explanation:

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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