Practice ECAT Physics questions with answers and explanations.
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Distance is a scalar and depends on the actual path.
It is always nonnegative.
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Average speed uses total path length.
It does not depend on direction.
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Average velocity is a vector based on net displacement.
A round trip can have zero average velocity.
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Slope gives change in displacement per unit time.
That is the definition of velocity.
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One metre equals 100 centimetres.
Therefore 250 cm ÷ 100 = 2.5 m.
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The metre is the SI base unit of length.
Other metric length units are derived from it using prefixes.
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Percentage uncertainty is absolute uncertainty divided by measured value times 100.
0.2/10.0×100 = 2%.
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The kilogram is the SI base unit of mass.
The gram is one-thousandth of a kilogram.
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Percentage error is |48-50|/50×100.
The result is 2/50×100 = 4%.
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The second is the SI base unit of time.
Minutes and hours are accepted non-SI units derived from it.
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Move the decimal four places to the right to obtain 7.2.
Therefore the exponent is -4.
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A scalar has magnitude only.
Speed has no associated direction.
