a projectile travels in the horizontal direction at a velocity of 200.0 meters/second from a cliff that is 200.0 meters high. after how many seconds will the projectile reach the ground level? a. 4.2 seconds b. 6.2 seconds c. 6.4 seconds d. 9.2 seconds

Option (c) is correct.The projectile will reach the ground after a time of 6.4 seconds.

Explanation:

Height of cliff= 200 m

initial velocity along vertical=0

initial velocity of horizontal=200 m/s

we use the kinematic equation;

h= Vit +1/2 gt²

200=0(t) + 1/2 (9.8)t²

4.9t²=200

t²=40.82

t=6.4 seconds

conduction, convection, radiation