Astudent throws a 4 kg rock against a wall. the kinetic energy of the rock was 50 j. what is the speed of the rock as it hit the wall?

The velocity with which the ball hit the wall is 5 m/s

Step-by-step explanation:

Given as :

The mass of rock = 4 kg

The kinetic energy of the rock = 50 J = 50 kg

Let The speed of rock = V

So, From Kinetic energy formula

Kinetic energy ( K E ) =

Or, 50 J =  

Or, = V²

Or, 25 = V²

∴   V = = 5  m/s

Hence The velocity with which the ball hit the wall is 5 m/s    Answer

x= -3

step-by-step explanation:

step 1: simplify brackets

4 - x - 1 = 6

step 2: simpilfy

3 - x = 6

step 3: subtract 3 from both sides

-x = 6 - 3

step 4: simpilfy 6 - 3

-x = 3

step 5: multiply both sides by -1

x = -3

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24