Question

You toss a 100-g rock in the air with a kinetic energy of 5.0 J. How much is its speed as it leaves your hand

Answer 1

The speed is 10 m/s

Step-by-step explanation:

Th mass if the rock = 100 g = 0.1 kg

The kinetic energy = 5.0 J

speed of the rock = ?

The kinetic energy of the rock is given by the equation

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

where

m is the mass of the rock

V is the velocity of the rock

substituting, we have

5 =
`(1)/(2) *0.1*v^(2)`

`v^(2)` = 5/0.05 = 100

v =
`√(100)` = 10 m/s