You always multiply the mass (kg) by the velocity at which the object is travelling (m/s) to get the momentum (kg m/s) thus: 30 × 5 = 150 kg m/s
Do not see the statements
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No. Touching a live electric current is never a good idea.
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Polished surfaces reduce heat loss
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The batteries make it possible to store the electricity generated when the sun and wind peak so it can be available to the grid when electricity demand is at its peak.
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