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 horizontal velocity remains constant at 10 m/s, and the vertical velocity increases due to gravity. The acceleration due to gravity is 9.8 m/s².

A Boy on a Skate Board Skates Off a Horizontal