Please please help!! 3.) A frustrated tennis star hits a ball straight up into the air at 22.8 m/s.
How long before the ball hits the ground? How high did the ball go?
4.) What is the velocity of the ball in #3 right before it hits the ground?

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Me pl give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

While preforming an experiment involving a reaction between two chemicals the scientist observes that the reaction container has become warm the observation is an example of