25) a 10 kg box is sitting on a shelf 15 feet in the air. how could you increase the potential energy of the box? (check all that apply)  raise the box to 20 feet.  lower the box to 10 feet  increase the mass of the box to 15 kg  decrease the bass of the box to 5 kg  drop the box off of the shelf.

Aparticle initially moving east with a speed of 20.0 m/s, experiences an acceleration of 3.95 m/s, north for a time of 8.00 s. what was the speed of the particle after this acceleration, in units of m/s? give the answer as a positive number.

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

Which of the following is not a physical property of mattera. melting pointb. heat of combustionc. viscosityd. boiling point