Answer:
196J
Explanation:
Given parameters:
Mass of skateboard = 1kg
Height off the ground = 20m
Unknown:
Potential energy = ?
Solution:
The potential energy is the energy due to the position of a body above the ground.
It is mathematically expressed as:
Potential energy = mass x acceleration due gravity x height
Potential energy = 1 x 9.8 x 20 = 196J
The force he must exert is 300 N
C. water
answer a has one sodium atom and one chlorine atom
answer b is a chemical reaction
answer d has only one hydrogen atom and one oxygen atom
