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Question

Define the standard kilogram.

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Answer

The standard kilogram is the mass of a block of a platinum alloy kept at the international bureau of weights and measures near Paris in France.

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Velocity-time graph for the ball’s motion is shown in figure.

Observe the graph and answer the following questions. Assume that g = 10 m/s2 and that there is no air resistance. (a) In which direction is the ball moving at point C? (b) At which point is the ball stationary? (c) At which point is the ball at its maximum height? (d) what is the ball’s acceleration at point C? (e) What is the ball’s acceleration at point A? (f) What is the ball’s acceleration at point B? (g) At which point does the ball have the same speed as when it was thrown?

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