Miriam accidentally drops her cell phone during a call. It falls for 0.5 s before hitting the ground. What is the speed of the phone at 0.5 s? Assume only gravity is acting on it. A. 5 m's B. 10 m/s C. 20 m/s D. 0.5 m/s​

5 m/s

Explanation:

v = at

v = 9.8(0.5) = 4.9 m/s

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

d.7.5cm is your answer