what is the kinetic energy of a 1 kilogram ball thrown into the air with an initial velocity of 30 m/s

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

"if the pressure acting on an ideal gas at constant temperature is tripled, its volume isa) reduced to one-third. b) increased by a factor of three. c) increased by a factor of two. d) reduced to one-half"

Aspring that is stretched 2.6 cm stores a potential energy of 0.053 j. what is the spring constant of this spring?