A 1-kg firecracker initially at rest splits into two pieces. Piece #1 has a mass of 25-kg. Piece #2 moves with a velocity of 12 m/s to the right. (A) What is the mass of the second piece? (B) What is the velocity of the first piece?

How does an observation about an object differ from an inference about that object

What you see with your eyes is a form of energy. a. light b. heat c. chemical d. electrical

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.