Question

4. A disobedient student dropped his Physics textbook (mass 0.1kg) from the window (15m above the ground). How fast was it going when it hit the ground?

Answer 1

v= 17.15 m/s

Step-by-step explanation:

mass of the book=0.1 Kg

height above ground, h= 15 m

Using conservation of energy

Potential energy is converted into kinetic energy

`mgh = (1)/(2)mv^2`

`v=√(2gh)`

`v=√(2* 9.8* 15)`

`v=√(294)`

v= 17.15 m/s

Hence, the book will hit the ground at the speed of 17.15 m/s.