In a position vs. time graph depicting the motion of two different objects, the point at which the lines intersect is where the objects:
a.
have the same position.
c.
collide.
b.
have the same speed.
d.
none of the above.

The law of conservation of energy states that energy cannot be created or , energy can be from one substance to another. the first blank is ' destroyed ' and for the second blank is ' transferred '

This is the substance(s) formed in a chemical reaction.

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.