3questions, 10 points a question, will give brainliest.
question 1: in which of these situations, is mechanical energy being conserved? (neglect, air resistance, friction and breaking) check all that apply.
question 1 options:

child on a swing

pendulum

bow and arrow

roller coaster

question 2: as an object falls to the ground, its potential energy is being converted to kinetic energy.

question 2 options:
true
false

question 3: calculate the potential energy stored in a 10 kg block, 5 meters above the ground.

question 3 options:

490 j

50 j

490 n

50 n