**What is gravitational potential energy?** - The energy an object has due to it's position of height in a gravitational field. (Ep = m x g x h). Where Ep is the change in gravitational potential energy in Joules (J), m is the mass in kilograms (kg), g is the gravitational field strength in newtons per kilograms (N/kg) and h is the change of height in metres (m).

**What are the units for Gravitational Field Strength** - N/kg

**If the gravitational field strenght on Earth is 10 N/kg, what is the weight of someone who has a mass of 70kg?** -

**If the person in question 8 stood on a stool which is 1m high, what would their gravitational field energy be?** -

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