The speed of the runner is 300 m /38 seconds. You can simplify this answer to be about 7.9 m/s
There are none on the list you included with your question.
It depends, You have to have the length and the width of the crest wave.
The answer is D. Because the boy jump 3 high
When glass is rubbed with a dry cloth, the friction creates charged static electricity; this in turn attracts small non charged particles of dust. The simplest way to put it, the dry cloth creates a static charge that attracts non charged dust particles.
