Which of these is the best example of potential energy?

a. a ball rolling across the floor

b. a runner lying on the ground after a race

c. a wind-up toy with the spring tightly wound

d. Jack and Jill at the bottom of their hill

A spelunker is surveying a cave. she follows a passage 170 m straight west, then 250 m in a direction 45â east of south, and then 280 m at 30â east of north. after a fourth unmeasured displacement, she finds herself back where she started.

An ice cream machine produced 44 ice creams per minute. After reconditioning, its speed increase to 55 ice creams per minute. By what percent did the speed of the machine increase

a bus starts to move with the speed of 20 m/s. calculate the time taken by the bus to cover a distance of 72km

A large crate is at rest on a horizontal floor. The coefficient of static friction between the crate and the floor is 0.500. A force F⃗ is applied to the crate in a direction 30.0∘ above the horizontal.

A ball traveling with an initial momentum of 4.5 kgm/s bounces off a wall and comes back in the opposite direction with a momentum of - 3.5 kgm/s. What is the change in momentum?

Your friend says your body is made up of more than 99.9999% empty space. What do you think

What is the momentum of a 30-kilogram cart moving with a speed of 10 meters per second

Which distance can be most accurately measured with a ruler? a. the size of an object under a microscope b. the width of a book c. the length of a river d. the distance between two cities?

What is the largest meteoroid that has collided with this planet

What is the upper layer of the atmosphere