A 0.74 kg projectile is fired into the air from the top of a 8.11 m cliff above a valley.

Question

Its initial velocity is 8.2 m/s at 36 ◦ 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.

How far from the bottom of the cliff does the projectile land? Answer in units of m.

Answer 1

x = 8.2cos36°t; y = 8.11 + 8.2sin36°t - 4.9t² = 0; t = 1.87 s;

then x = 12.41 m