Conservation of Energy from Mr. Caruana
(+ answers)
1. Calculate the Kinetic Energy of a 1500 kg car traveling at 20 km/h. (2.3x104 J)
2. Calculate the velocity of a 140 kg lion (in km/h) that has a kinetic energy of 28 kJ. (72 km/h)
3. Calculate the height that a 2500 kg airplane is flying if it has 9.8 x 107 J of gravitational energy. (4 km)
4. How far was a 1500 kg car pushed if a force of 700 N is applied to it and 2800 J of energy was used up by
the person pushing it? (4.0 m)
5. A 70 kg person is shot out of a cannon. The cannon pushes on the
person with a force of 3600 N for the entire 3.0 m length of the
cannon. How fast is the person traveling when they leave the cannon?
(18 m/s)
6. A 1200 kg car that is at rest is pushed with a force of 800 N for a
distance of 60 m. What is the velocity of the car at this point? (8.9 m/s)
7. A shopping cart with a rider has a mass of 300 kg. It is in a race
traveling at 2.0 m/s. The person pushing it decides to push with a
force of 200 N for the final 19 m of the race. What is the final
velocity of the carts it crosses the finish line? Convert this to
km/h. (19 km/h)
8. Another rider in the race has a mass of 280 kg with the cart and crosses the finish line traveling at 8.0 m/s.
The person pushing the cart tries to slow the cart down by pulling on it with a force of 800 N for a
distance of 6.0 m. How fast is the cart going after this happens? (10 m/s)
9.
A 70 kg skydiver jumps from rest off the CN tower at a height of
550 m. How fast is the skydiver traveling when he is 300 m from
the ground? (70 m/s)
10. A 30 kg toy airplane is traveling at 18 km/h at an altitude of 4.0 m. How fast will it be traveling if it
reduces its altitude to 1.0 m? (33 km/h)