The velocity of the ball is 7 m/s
Explanation:
The motion of the ball is a free fall motion, so it means that the ball falls down under the effect of the force of gravity only. Therefore, it has a constant acceleration (acceleration of gravity, g), and we can use the following suvat equation:
where
v is the final velocity
u is the initial velocity
a is the acceleration
s is the displacement
For the ball in this problem, we have:
u = 0 (initial velocity, the ball is dropped from rest)
(acceleration of gravity)
s = 2.5 m (vertical displacement)
Solving for v, we find the velocity at which the ball hits the concrete surface:
Learn more about free fall motion:
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1) True.
Uniform circular motion means that the angular velocity
is constant, and since the centripetal acceleration is given by
if
is constant, then a is constant.
2) The correct answer is
<span>a.) the angular velocity and linear velocities are the same
The three knots are in fact on a circle, therefore the angular velocities are the same (because they cover the same angle in the same time) and the linear velocities are the same as well, because it is given by
</span>
and since both r(distance from the center) and
are the same, v is also the same.
3) <span>b.) toward the center
In fact, an object can move on a circular path only if there is a force pushing towards the center. This force is called "centripetal force".</span>
I remember c/d. That's not a problem. But if you want 'c', you'll have to give me 'd'.
