The best example of an elastic collision from above is that of a cart which rammed into another one and they are now pushed apart. The last option is the correct answer. An elastic collision occurs when two objects bounce apart when they collide thus, preserving kinetic energy and momentum.
(a) The ball’s maximum speed over the net is v(max) = √2gh.
(b) The maximum speed of the horizontally moving ball clearing the net is about 27 m/s.
(c) Speed of the ball is independent of its mass.
<h3>
Time of motion of the ball</h3>
The time of motion of the ball is calculated as follows;
h = vt + ¹/₂gt²
1 = 0 + ¹/₂(9.8)t²
1 = 4.9t²
t² = 1/4.9
t² = 0.204
t = 0.452 s
<h3>Horizontal speed of the ball</h3>
The horizontal speed of the ball is calculated as follows;
X = vt
v = X/t
v = (12 m)/(0.452)
v = 26.6 m/s ≈ 27 m/s (proved)
<h3>Conservation of energy</h3>
P.E = K.E
mgh = ¹/₂mv²
gh = ¹/₂v²
2gh = v²
√2gh = v(max)
Speed of the ball is independent of its mass.
Learn more about horizontal velocity here: brainly.com/question/24681896
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Knowing the distance covered and the time to cover the distance,
you can calculate the car's average speed during that time.
Average speed = (distance covered) / (time to cover the distance)
Average speed = (30 km) / (20 minutes) = 1.5 km/minute .
Note: You do NOT have enough information to calculate velocity.
According to the Doppler effect page I just read it should be D
Here the right answer
The motor is connected to a battery. When the switch is closed, the current starts<span> to flow and the coil becomes an electromagnet. In this case the current is flowing </span>anticlockwise<span> in the top of the coil. This makes the top a </span>north<span> pole. This north pole is </span><span>attracted </span><span>to the south pole on the left. So the top of the coil </span>turns<span> towards the left. Notice that the bottom of the coil is a </span>south<span> pole and is attracted to the magnet on the right. Hope this helped</span>