Achild in a boat throws a 5.80-kg package out horizontally with a speed of 10.0 m/s. the mass of the child is 24.6kg and the mass of the boat is 39.0kg . (figure 1)

calculate the velocity of the boat immediately after, assuming it was initially at rest.

express your answer to three significant figures and include the appropriate units. enter positive value if the direction of the force is in the direction of the velocity of the box and negative value if the direction of the force is in the direction opposite to the velocity of the box.

1. a net force of 100 newton’s is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of

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.

Estimate of the number of stars in our galaxy