..celeste
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Please can someone help me answer this question:
A 12.5g ball with 40 J of energy in its kinetic energy store is travelling horizontally through the air. Calculate its velocity.

I’m not quite sure how to work it out.
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username1258931
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(Original post by ..celeste)
Please can someone help me answer this question:
A 12.5g ball with 40 J of energy in its kinetic energy store is travelling horizontally through the air. Calculate its velocity.

I’m not quite sure how to work it out.
Use the kinetic energy equation E=1/2 m v^2

The direction of travel just means you don’t have to take into account potential energy as the object isn’t changing height.
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Eimmanuel
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(Original post by ..celeste)
Please can someone help me answer this question:
A 12.5g ball with 40 J of energy in its kinetic energy store is travelling horizontally through the air. Calculate its velocity.

I’m not quite sure how to work it out.
Do you know the formula for kinetic energy?

Spoiler:
Show

KE =  \frac{1}{2}mv^2


You are told that the ball has 40 J of KE, form a single variable equation with the velocity as your unknown variable. Note that mass need to be kg not g in the KE formula.

Spoiler:
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 \frac{1}{2}mv^2 = 40
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