1. Determine the potential energy of a 2kg rock at the top of a hill that is 20m high. 2. Determine the kinetic energy of a 2000 kg roller coaster car that is moving with a speed of 25 m/s.

3. A 80kg freezer is located in an office on the 59 floor of an office building 200 meters above the ground. What is the potential energy of the freezer?

​

Explanation:

1. The potential energy of an object is given by . Substituting given values, we have:

2. The kinetic energy of an object is given by . Substituting given values, we have:

3. 1. The potential energy of an object is given by . Substituting given values, we have:

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach