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Physics
Physics
Problem
A boy walks
40
m
40\,\text{m}
40
m
east and then
40
m
40\,\text{m}
40
m
west in
40
s
40\,\text{s}
40
s
. Let
v
s
v_s
v
s
be the average speed and
v
v
v_v
v
v
be the magnitude of average velocity for the entire walk. Which statement is correct? a)
v
s
=
v
v
v_s = v_v
v
s
=
v
v
b)
v
s
>
v
v
v_s > v_v
v
s
>
v
v
c) Both
v
s
v_s
v
s
and
v
v
v_v
v
v
are zero d)
v
s
<
v
v
v_s < v_v
v
s
<
v
v
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