Q2)Spherical wave fronts are made of curved lines. When are they said to be parallel lines?
1-When the distance is very close from the source
2-When the distance is very far from the source
3-When the frequency is very high
4-When the wavelength is very high

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We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

An athlete is holding 24 lb of weights at a height of 6 inches above the stack as shown. to lower the weights, she applies a constant force of 5 lb to the handle. determine the velocity of the weights immediately before they hit the stack.