Sunlight, with an intensity of 677 W/m2, strikes a flat collecting surface perpendicularly and is totally absorbed. The area of the surface is 9.25 m2. What is the force F in micronewtons that acts on the surface due to the sunlight

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)