Question

A book falls from a table. If there is no air resistance, what is the position-
time graph for this book?
Position (m)
Position (m)
Time (s)
Time (s)
Position (m)
Position (m)
Time (s)
Time (s)
O
A. Graph C
O
B. Graph A
O
C. Graph B
O D. Graph D

Answer 1

Answer:

Graph C

Explanation:

The book is in free fall (no air resistance), this means that it is subject to a constant acceleration,

$g=9.8 m/s^2$

downward, which is the acceleration of gravity.

Therefore, taking downward as positive direction, its position at time t will be given by

$s=\frac{1}{2}gt^2$

where t is the time.

We see that the equation above represents a parabola: the only graph representing a parabola is graph C), therefore this is the correct option.

Answer 2

Answer:

Graph A

Explanation: