Question

If a penny is dropped from rest from a building takes 2 seconds to hit the ground, calculate the velocity of the penny right before it touches the ground?

a. 19.6 m/s
b 9.8 m/s
c. 0 m/s
d 29.4 m/s​

Answer 1

20m/s

Step-by-step explanation:

u = 0m/s

t = 2s

a = +g = 10m/s²

t = 2d

v = ?

v = ut + 1/2at²

v = 0(2) + 1/2(10)(2)²

v = 0 + 5(4)

v = 20m/s