Which of the following has kinetic energy?
A book on a shelf
A girl sprinting
A stretched spring
Which of the following has gravitational potential energy?
What is the unit of gravitational potential energy?
J
N
N/kg
A girl of mass 60 kg can sprint at 8 m/s. What is her kinetic energy?
240 J
1920 J
3840 J
A car of mass 1500 kg, travelling at a steady speed, has a kinetic energy of 200 kJ. What is the speed of the car?
0.52 m/s
16.3 m/s
266.7 m/s
What is the gravitational potential energy stored in a 60 kg boy sitting at the top of a 2 m high slide? (g = 10 N/kg)?
120 J
600 J
1200 J
A 2 kg mass has a potential energy of 580 J. What height is the mass above the ground? (g = 10 N/kg)
29 m
58 m
290 m
A car travelling along a straight road has kinetic energy of 180 kJ. The brakes are applied, and it is brought to rest over a distance of 60 m. What is the average force of the car breaks?
3 N
3000 N
10,800 N
A ball of mass 500 g is dropped from rest from a height of 7 m. What is its speed as it reaches the ground? (g = 10 N/kg)
10 m/s
11.8 m/s
140 m/s
A mass of 40 kg and a mass of 80 kg are dropped from rest, from the same height. If air resistance is ignored, which would hit the ground first?
The 40 kg mass
The 80 kg mass
Both at the same time