A 25.5 kg child swings on a swing set. At the top of the swing's arc, the child reaches a height of 1.50 m from the
ground. What are the child's PE and KE at the top of the arc?
188 J and 1883
OJ and 375)
375 J and OJ

375 J and 0J

Explanation:

At the top of the arc, the child's height is 1.5m from the ground.

mass, m = 25.5 kg, assume g = 9.81m/s²

Hence,

Potential Energy, PE

= mgh

= (25.5) (9.81) (1.5)

= 375.23

= 375 J (answer, nearest whole number)

Note that at the top of the arc, the boy will momentarily come to a complete stop (i.e velocity = 0)

Hence the Kinetic Energy will be 0 at the top of the arc.  (answer)

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.

this could be newton#'s law of cooling. the cooling curve is exponential