What is the net force on an object that has a force pushing downward at 25n and a forcing pushing upward at 10n?

15N downwards

Explanation:

Net force is the sum of all forces acting on an object.

Taking upwards as positive and downwards as negative,

Net Force = 10N + (-25N)

= -15N

Hence Net Force is 15N downwards.

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wavelength divides in half and speed stays the same.