Define the term velocity.
A ball with mass $0.45\,\text{kg}$ leaves the side of a table with a horizontal velocity $v$, as shown in Fig. 2.1. The table is $1.25\,\text{m}$ high. Before reaching the floor, the ball moves $1.50\,\text{m}$ horizontally. Air resistance may be ignored. Calculate the horizontal velocity $v$ as it leaves the table.
Calculate the velocity at the instant the ball strikes the floor, giving both the magnitude of the velocity and the angle to the horizontal.
Calculate the kinetic energy at the moment the ball reaches the floor.
Calculate the loss in gravitational potential energy as the ball drops from the table to the floor.
Explain why the kinetic energy of the ball in part (b)(iii) is not the same as the loss of gravitational potential energy in part (b)(iv).