Question

kinetic energy of a ball of mass 50 gram is 10 joule .find the speed of the ball.​

Answer 1

Answer:

let the v be = v

therefore, ½mv² = 10

= 25v² = 10

= v² = 10/25

= v = √(10/25)

= v = 3.162/5

= v = 0.6334m/s

Answer 2

Answer:

20 m/s

Explanation:

Kinetic energy formula = 1/2 mv²

Now, convert 50 g into kg

=> 50 g = 50/1000 => 0.05 kg

Putting values,

10 J = 1/2*0.05 kg*v²

=> 20 = 0.05v²

∴ v² = 20/0.05 => 2000/5 => 400

∴ v = √400 => 20 m/s