Question

A partially filled bag of cement with mass of 16 kg falls 40 m into a river from a bridge. What is its speed just before it hits the water?

Answer 1

28 metres

Step-by-step explanation:

when the bag is about to hit the ground

potential energy = kinetic energy

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

where m = mass

g = acceleration due to gravity

v = speed

when you simplify the above equation and make v subject of the formular we have

`v=√(2gh)`

where g = 9.8m/s

h = 40

`v=√(2* 9.8* 40)=28m`