First slide

Release from certain height

Question

A stone is dropped from a 25th storey of a multistoreyed building and it reaches the ground in 5 sec. In the first second, it passes through how many storeyed of the building ? (g = 10 m/s²)

Easy

A

1
B

2
C

3
D

None

Solution

Let h be the height of each storey. Then
$25 h = 0 + \frac{1}{2} \times 10 \times t^{2}$
or 25h = 5x(5)² or h-5metre
For first case, let the stone pass through n storeys. So
$n \times 5 = \frac{1}{2} \times 10 \times (1)$
n = 1

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App