Question

A stone is dropped from the top of a tower of height 11.25 m. Calculate the time it will take to reach the ground. (g = 10 ms-2)

Answer 1

Explanation:

We know,

from the motion equation

• S = ut + ½ gt²
• u = 0
• g = 10
• t = ?
• 11.25 = (0)t + ½ (10)t²
• 11.25 = 5t²
• t² = 11.25 / 5
• t² = 2.25
• t = √2.25
• t = 1.5

Answer 2

Explanation:

We know,

from motion equation

S = ut + ½ gt²

u = 0

g = 10

t = ?

11.25 = (0)t + ½ (10)t²

11.25 = 5t²

t² = 11.25 / 5

t = √2.25

t = 1.5