120n
since the speed is doubled, her force is doubled
Answer:
Explanation:
Assuming no friction between the roller coaster car and the hill, and neglecting air resistance, the kinetic energy the roller coaster car would have at the bottom of the hill would be equal to its gravitational potential energy at the top of the hill, by conservation of energy.
As we know that in transformers we have

here we know that



now from above equation we will have


