Lift Weight

Pam normally weighs \(\SI{60}{\kilo\gram},\) but one day she measured her weight in an elevator as \(\SI{70}{\kilo\gram}.\)

Can we say for sure whether the elevator was moving up or down at the moment she measured her weight?

The red arrows indicate the direction of motion.

The red arrows indicate the direction of motion.

Hint: Consider not just the velocity, but the acceleration of the elevator. Do velocity and acceleration always have the same direction?

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