Question

Brandon Stark saw some suspicious activity at the terrace of a tower. When he reached there, he saw some thieves and hurried back to inform his father. Accidentally, he fell from the top of the tower and landed on the ground exactly 2 seconds later. Find the height of the tower.

$g=10m/s^2$

• A. 5 m
• B. 10 m
• C. 15 m
• D. 20 m

Answer 1

The correct option is D

20 m

Brandon experienced a free fall from the top of the tower and, thus, was under the acceleration due to gravity (g). After every second, he gained a velocity of 10 m/s.
Distance travelled in 2 seconds can be found out by applying equation for laws of motion
$s=ut+\frac{1}{2}g{t}^2$
Since he fell from rest, u = 0
$s=\frac{1}{2}\times g{t}^2=\frac{1}{2}\times 10\times 2^2=20m$