The final velocity of the pebble as it hits the ground is 21.5 m/s.
We have to use the equation;
v = u + gt
Where;
v = final velocity
u = initial velocity
g = acceleration due to gravity
t = time
Since the pebble was dropped from a height, u =0 m/s, hence,
v = gt
v = 9.8 ms-2 × 2.2 s
v = 21.5 m/s
Learn more about velocity: brainly.com/question/8898885
Answer:
<h2>0.9 Joules</h2>
Explanation:
Elastic potential energy of a spring= 1/2 × Spring constant × displacement²
following calculations you will get ur answer!!
Power is work over time.
We can solve for work by using F*d
Now solve for power:
20,000,000
To see things at a nanometer, which is a trillionth of a meter, you would need to increase magnification nearly 20,000,000 times those are ionizing atoms
