D is at rest at the top of a 2 m high slope. The sled has a mass of 45 kg. The sled's potential energy is J?

Which of the following is an example of Newton's first law of motion? Sam's bike hits a curb and he flies over the handlebars, onto the grass. A feather and a brick are dropped from a ladder. The brick exerts a greater force when it hits the ground.

A spring has a natural length of 28 cm. If a 27-N force is required to keep it stretched to a length of 32 cm, how much work W is required to stretch it from 28 cm to 30 cm? (Round your answer to two decimal places.) W = 13.

Assuming that Albert's push and the friction with the floor are the only horizontal forces acting, what is the magnitude of the frictional force pushing backward on the box

If all vegetation in the pond died what effect would it have on the animals? and why

What stage do most stars spend the majority of their lives in?

How are electric circuits and systems for carrying water in building similar

A girl scout is pulling her 30 kg wagon of cookies with a force of 60 N to right. Friction pulls back with a force of 15 N left. What is net force on the wagon

10. A bullet is moving at a speed of 367 m/s when it embeds into a lump of moist clay. The bullet penetrates a foe and comes to a stop at a distance of 0.0621m. Determine the acceleration of the bullet while moving into the clay.

What are the units for mass and volume

A car traveling with constant speed travels 150km in 7200s. What is the speed of the car