Answer:
Potential Energy stored = mgh ; m : mass, g : gravitational acceleration (let 10m/s) , h : height
Hence,
Energy Stored in the ball = mgh = (2*10*4) J
= 80 Joules!
Answer:
50.2 meters
Explanation:
When an object falls, it goes a distance d in time t according to the formula:
d is the distance in meter, g is the acceleration due to gravity with the value of 9.8
, t is the time in seconds
Therefore, 
d= 50.176 ≈ 50.2m
Answer: The correct answer would be C. Salt crystals are hard and brittle because they are made up of atoms that combine by ionic bonding.
Explanation: All the other ones are chemical changes because a new substance is formed.
