The kinetic energy of a 90.0 kg hockey player is estimated to be 1125 J. With what speed is he skating?

GPEtop = KEbottom

m = 0.4 kg

g = 10 N/kg

h = 2.5 m

(mgh)top = ( mv2)bottom

0.4 kg x 10 N/kg x 2.5 m = x 0.4kg x v2

10 = 0.2 v2

v2 =

v2 = 50

v =

v = 7.1 m/s

The ball returns to the ground with a speed of 7.1 m/s.

Explanation:

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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.

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

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