PROJECTILE MOTION! HELP ASAP!

Question

A 0.66 kg projectile is fired into the air from the top of a 14.5 m cliff above a valley. Its initial velocity is 6.99 m/s at 48◦ above the horizontal. How long is the projectile in the air? The acceleration due to gravity is 9.8 m/s 2 . Answer in units of s.

Answer 1

y = 14.5 + 6.99sin48°t - 4.9t² = 0; 4.9t² - 5.195t - 14.5 = 0 t = 2.33 s

Answer 2

y = 14.5 + 6.99sin48°t - 4.9t² = 0; 4.9t² - 5.195t - 14.5 = 0 t = 2.33 s