Physics
A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s. The work done by the force will be ________

30 J
20 J
50 J
40 J

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Physics
A standing wave occurs when

The amplitude of a wave exceeds its wavelength
A wave reflects upon itself
Two waves overlap
The speed of the wave is zero or near zero

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