How to find the velocity when an object hits the ground physics?

A toy rocket is launched twice into the air from level ground and returns to level ground. The rocket is first launched with initial speed v at an angle of 45° above the horizontal.

A 400 kg object is sitting at rest at the top of a hill that is 30.0m high and 80.0m long measured along the hill. If there is no friction, how fast will the object be going at the bottom of the hill?

What is the difference between the inner and outer planets?

The electric field of a charge Q at a distance d away is measured as E What will the electric field measure at a distance 1/2 d away from the charge?

Why do some nucleus release electrons?

A 0.065-kg tennis ball moving to the right with a speed of 15 m/s is struck by a tennis racket, causing it to move to the left with a speed of 15 m/s. if the ball remains in contact with the racquet for 0.

Which of the following are thought to be rapidly rotating neutron stars with intense magnetic fields? Choose one answer. a. pulsarsb. white dwarfsc. black holesd. flare starse. accretion disks

Which of the following can be a centripetal force? a. friction c. tension b. gravity d. all of the above

A man with a mass of 60 kg walks up two flights of stairs in going from the first floor to the third floor (10 meters). Calculate his increase in potential energy

At a certain harbor, the tides cause the ocean surface to rise and fall a distance d (from highest level to lowest level) in simple harmonic motion, with a period of 12.4 h. how long does it take for the water to fall a distance 0.