Answer:

Explanation:
When an object goes on a circular movement, it has a centripetal acceleration that always points toward the center of the circle, it is the responsible of the change of direction in the movement of the object. and that centripetal acceleration is related with the speed in the next way:
, with v the speed, r the radius of the track that is half of the diameter (22.5 m)


Answer:
Renewable energy sources can come again, but nonrenewable is gone forever. For example, coal and gasoline are both nonrenewable.
Explanation:
Answer:
It depends on the ratio of nuetrons to protons
Momentum = mass X Velocity
Using logic we can see that the velocity would be positive so 2.40 doesn't change.
120/2.40 = 50kg
Mass of object is 50 kg.
Hope that helps! :)