At t = 0 a ball is thrown upward from the
ground at point O. Two seconds later the ball
hits the ground. What is the maximum height of the ball?
Take the acceleration due to gravity to be 10
m/s^2
What is the initial velocity of the ball?
For an initial velocity of v0, what is the velocity of the ball as it passes the point A on its
way up, where OA is one third the maximum
height?

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

What is the temperature in degrees celsius of a substance with a tempature of 49k