19. a small dog is trained to jump straight up a distance of 1.2 m. how much kinetic energy does the 7.2-kg dog need to jump this high? (the acceleration due to gravity is 9.8 m/s2.) show your work for credit.

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

Determine the maximum r-value of the polar equation r =3+3 cos 0

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?