Question

What is the kinetic energy of a 4kg volleyball that travels a distance of 40 meters in 2 seconds

Answer 1

Answer:

Explanation:

velocity =distance/time

v=40/2=20

mass =4kg

K.E =1/2mv^2=1/2*4*20^2=800

Answer 2

Given :-

• Mass of volleyball = 4kg  
• Displacement of ball = 40m
• Time taken = 2 sec  

To Find :-

• Kinetic energy  

Solution :-

~Here, we’re given mass of volleyball , displacement and time taken to travel and we need to calculate the kinetic energy. Firstly, we’ll find the velocity of the volleyball and then kinetic energy by putting values in it’s formula.  

_____________  

As we know that,

★ Velocity = Displacement/Time

★ Kinetic energy = ½ mv²

Where,

• m is mass
• v is velocity

Finding velocity of volleyball :-

⇒ Velocity = Displacement/Time  

➟ 40/2  

↬ 20 m/s  

Finding kinetic energy :-  

⇒ Kinetic energy = ½ mv²

➟ ½ × 4 × 20 × 20  

➟ 2 × 20 × 20  

➟ 40 × 20  

↬ 800 J  

_____________

Hence,  

• Kinetic energy is of 800 J