A man runs 650 m east and then turns and runs 850 m west. This takes him 240 seconds.
1 answer:
Answer:
v = 6.25 m/s
Explanation:
Given that,
A man runs 650 m east and then turns and runs 850 m west. This takes him 240 seconds.
Let east is positive and west is negative
Average velocity = total displacement/total time taken
Total displacement = final psoition - initial position
D = -850 - 650 = -1500 m
So,
So, 6.25 m/s is the average velocity of the man.
You might be interested in
Answer:
The same amount of energy is required to either stretch or compress the spring.
Explanation:
The amount of energy required to stretch or compress a spring is equal to the elastic potential energy stored by the spring:
where
k is the spring constant
is the stretch/compression of the spring
In the first case, the spring is stretched from x=0 to x=d, so
and the amount of energy required is
In the second case, the spring is compressed from x=0 to x=-d, so
and the amount of energy required is
so we see that the amount of energy required is the same.