calculus
posted by nady .
2. A bullet is fired from the ground at an angle of 45o above the horizontal. What initial speed vo must the bullet have in order to hit a point 550 ft high on a tower located 600 ft away (ignoring air resistance)?

Write separate equations for x and y with Vo and t as the unknowns. Require that x = 600 ft and y = 550 ft at the same time t. Solve for Vo and t.