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A pencil on a car

publish date: 2022/08/06 08:32:00 GMT+10

volume_mute

Suppose you are a passenger in a car moving at 55 miles per hour.  You lift a pencil to the ceiling of the car and drop it.  Just before it hits the seat, how fast is it traveling forward? miles/hour.  Is the downward speed of the pencil increase or decrease?

Please drag and drop the selected option in the right place or type it instead
increase
descrease

Correct Answer

(1) 55
(2) increase

Explanation

Its forward speed is still 55 miles/hour; Its downward speed is increasing at the acceleration of gravity.

Reference

Basic Physics: A Self-Teaching Guide

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