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A cheetah can run briefly with a speed of 31 m/s. Suppose a cheetah with a mass of 47 kg runs at this speed. What is the cheetah’s kinetic energy?

• 1457 J

• 728.5 J

• 45,167 J

• 22,583.5 J

A ping pong ball has a mass of about 2.45 g. Suppose that ball is hit across the table with a speed of about 4.0 m/s. What is its kinetic energy?

• 19.6 J

• 0.0196 J

• 4.9 J

• 0.0049 J

What is the kinetic energy of a 26 kg eagle, flying at an altitude of 65 m at a speed of 19 m/s?

• 32,110 J

• 16,055 J

• 4693 J

• 247 J

A polar bear has an average mass of 500 kg. If its maximum kinetic energy is 60500 J, what is its top speed?

• 242 m/s

• 121 m/s

• 15.56 m/s

• 15,125,000 m/s

My bowling ball, when dropped from a roof, has 78,750 J of kinetic energy. If the ball has a mass of 7 kg, at what speed does it hit the ground?

• 22,500 m/s

• 150 m/s

• 33.9 m/s

• 1148 m/s

Find the speed of a model rocket that has a mass of 15 kg and Has 80,000 J of kinetic energy.

• 10666.7 m/s

• 103.9 m/s

• 5333.3 m/s

• 73.03 m/s

What is the Kinetic Energy of a 100 kg object that is moving with a speed of 12.5 m/s?

(a)  

What is the Kinetic Energy of a 100 kg object that is moving with a speed of 12.5 m/s?

(a)  

KE = 1/2 m s²

A 10 gram ball is rolling at 3 m/s. The ball has __________ energy. Calculate it.

• 30 joules

• 60 joules

• 45 joules

• 15 joules

KE = 1/2 m s²

Calculate the KE of a car that has a mass of 1000 kg and is moving at the rate of 20 m/s.

• 2,000 joules

• 200,000 joules

• 40,000 joules

• 20,000 joules