4.3 Exercise 3

Answer the following questions for projectile motion on level ground assuming negligible air resistance, with the initial angle being neither $0 °$ nor $90 ° :$ (a) Is the velocity ever zero? (b) When is the velocity a minimum? A maximum? (c) Can the velocity ever be the same as the initial velocity at a time other than at t = 0? (d) Can the speed ever be the same as the initial speed at a time other than at t = 0?