1. A
cheetah can run briefly with a speed of 30 m/s. suppose a cheetah with a mass
of 50 kg runs at this speed. What is the cheetah’s kinetic energy?
Answer :
kE= ½ mv2
= ½ x 50 kg x ( 30 m/s )2
= 22500 J
2. Calculate
the kinetic energy of moving 2 kg object traveling at a velocity of 5 m/s!
Answer:
kE= ½ mv2
= ½ x 2 kg x ( 5 m/s )2
= 25 J
3. How
much kinetic energy does moving 5 kg object have it moves with a velocity of 4
m/s?
Answer:
kE= ½ mv2
= ½ x 5 kg x ( 4 m/s )2
= 40 J
4. What
is the kinetic energy of a 10 g shotput thrown with a velocity 30 m/s?
Answer:
kE= ½ mv2
= ½ x 0.01 kg x ( 30 m/s )2
= 4.5 J
5. What
is the kinetic energy of a ball with a mass of 3 kg rolling at 10 m/s?
Answer:
kE= ½ mv2
= ½ x 3 kg x ( 10 m/s )2
= 150 J
6. A
60 kg of the horse is traveling at a constant speed of 8 m/s. What is its kinetic
energy?
Answer :
kE= ½ mv2
= ½ x 60 kg x ( 8 m/s )2
= 1920 J
7. What
is the kinetic energy of a 500g object moving at a velocity of 100 m/s?
Answer :
kE= ½ mv2
= ½ x 0.5 kg x ( 100 m/s )2
= 2500 J
8. What
is the kinetic energy of 100 g object moving at the velocity of 6 m/s?
Answer
kE= ½ mv2
= ½ x 0.1 kg x ( 6 m/s )2
= 1.8 J
9. What
is the kinetic energy of a 4000 g object moving at a velocity of 4 m/s? Provide
your answer in kJ!
Answer
kE= ½ mv2
= ½ x 4 kg x ( 4 m/s )2
= 32 J
= 0.032 kJ
10. How much kinetic energy does a person of mass
60 kg running at 3 m/s?
Answer
kE= ½ mv2
= ½ x 60 kg x ( 3 m/s )2
= 270
J
