Two ice skaters, of mass 30 kg and 80 kg, are skating across the surface of a frozen lake on a
collision course, with respective velocities of 2.0 m/s in a general north direction, and 1.0 m/s
generally west, as shown above. After they collide, the pair of skaters move off in a direction
north of west with a momentum of approximately 100 kg m/s. How much kinetic energy was
lost in the collision?
OJ
110)
55
70)
120

radiation warms things up temp rises convection currents air circ windy weather

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.