# Physics help

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#1
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.
0
3 years ago
#2
(Original post by ..celeste)
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.
0
3 years ago
#3
(Original post by ..celeste)
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:
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KE =

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.

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