Question

Lauryn serves a volleyball with a mass of 2.1 kg. The ball leaves her hand with a speed of 30 m/s.

Find the energy of the ball

Answer 1

Hi! Let's see.

TOPIC: Kinetic Energy.

Step-by-step explanation:

Data:

• Mass(m) = 2.1 kilograms
• Speed(v) = 30 m/s
• Kinetic Energy(Ek) = ?

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Use the kinetic energy formula:

• 
  `\boxed{\boxed{\bold{E_(k)=(m*(v)^(2))/(2)}}}`

Replace by the data:

• 
  `\boxed{E_(k)=(2.1kg*(30(m)/(s))^(2))/(2)}}}}`

We multiply speed squared:

• 
  `\boxed{E_(k)=(2.1kg*900(m)/(s))/(2)}}`

Multiply in the numerator, without forgetting the units:

• 
  `\boxed{E_(k)=(1890J)/(2)}}}`

Both numerator and denominador operations are divided:

• 
  `\boxed{\bold{E_(k)=945\ J}}`

Answer: The kinetic energy is 945 Joules.

Cordially Alejanndraax. Greetings!