kinetic and gravitational potential energy calculations 2

A 2 kg book is placed on a shelf 5 meters high. What is the potential energy of the book relative to the floor? (Use $$g = 9.8 \, \text{m/s}^2$$ )

What is the kinetic energy of a 500 kg car moving at 20 m/s?

A ball of mass 0.5 kg is thrown upwards with a velocity of 10 m/s. What is its kinetic energy at the moment it leaves the thrower's hand?

If a bird is flying at a height of 100 meters with a mass of 2 kg, what is its potential energy? (Assume $$g = 9.8 \, \text{m/s}^2$$ )

A cyclist and her bike have a combined mass of 80 kg and are moving at a speed of 5 m/s. What is the kinetic energy of the system?

A diver of mass 70 kg jumps from a 3 m high diving board. What is the potential energy of the diver at the top of the diving board? (Use $$g = 9.8 \, \text{m/s}^2$$ )

What is the kinetic energy of a 0.15 kg baseball traveling at a speed of 40 m/s?

A 10 kg object is held 2 meters above the ground. What is the potential energy of the object? (Assume $$g = 9.8 \, \text{m/s}^2$$ )

A roller coaster car with a mass of 500 kg is moving at a speed of 10 m/s. What is its kinetic energy?

If a stone of mass 1 kg is dropped from a height of 45 meters, what is its potential energy just before it starts to fall? (Use $$g = 9.8 \, \text{m/s}^2$$ )