A Physical Change, alters the form of a substance but does not change the material into another substance.
Formula for potential energy is:
pe = m * g * h
Where:
m = mass of an object
g = gravitational acceleration
h = height at which object is placed
From this equation we can make conclusion that increasing mass also increases potential energy. Object b has double the mass so it has double the potential energy.
Object a:
pe = m * 9.81 * 1
pe = 9.81 J
Object b:
pe = 2m * 9.81 * 1
pe = 19.62 J
Explanation:
<h2>Speed is the rate of change of distance with time.</h2>
Convert miles per hour into ft per second to get 71.43ft/s. Use the equation x=vt, x= 5,000 and v=71.43, solve for t. t=70s.