Answer:
0.125m/s^2
Explanation:
20-10=10
10 divided by 80=0.125m/s^2
<span>A rock is dropped from a sea cliff and hits the water 3.2s later. How high is the cliff?
t = sqrt(2y/g)
3.2 = sqrt(2y/9.81)
y = 50.23 m
</span><span>How long would it take sound to travel the same distance?
t = 50.23 / </span><span>343 m/s
t = 0.15 s
</span><span>How long would it take light to travel this distance?
t = 50.23 / </span><span>299 792 458 m / s
t = 1.68x10^-7 s</span>
When a ball is whirled using a string, it is restricted to move only in circular motion because the net force acting on the ball is towards the center of the circle. Hence, the acceleration of the ball is towards the center. But the velocity of ball is tangential to this circular path all the time. When the whirling is stropped, the string becomes slack and tension in the string becomes zero. The ball no more performs circular motion and the ball moves tangentially to the circle in straight line. Therefore, before letting go, velocity was variable. After letting go, velocity becomes constant.
