A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are: A) 10 m/s; 9.8 m/s². B) 9.0 m/s; 9.8 m/s². C) 9.0 m/s; 9.0 m/s². D) 1.0 m/s; 9.0 m/s². E) 1.0 m/s; 9.8 m/s².

Question

Quizplus · Accepted Answer

The velocity in the horizontal direction remains constant at 10 m/s since there are no forces acting in the horizontal direction after the boy leaves the bench. The acceleration is due to gravity, which is 9.8 m/s^2 downward.

A Boy on a Skate Board Skates Off a Horizontal