physics mc question!!!!HELP
posted by lilly .
Question # 1 : It a particle increases its speed by a factor of 2, what happens to the kinetic energy?
b)cuts in half
c)increases by a factor of 4
d)depends on whether or not work is done on the particle
Question # 2: An object falling near the surface of the Earth
a)decreases its potential energy due to gravity
b)has positive work done on it by gravity
c)both a and b
d)either a or b, depending on whether or not the Earth and the object or just the object are the system.
compare (1/2) m v^2 to (1/2) m (2 v)^2
the second is 4 times the first
a) is correct
b) is correct