Can you list the rest of the question?
Answer:
k first of all, ur not hopeless. everyone needs a bit of help some time.
Explanation:
The answer should be B.
This is because we can learn with new technology and data and evidence how we can change or fix an old theory that may have been made a long time ago. For example, with new data, we can learn and change our old ideas that were made years ago. Now, our data can be more precise. Therefore, our ideas and theories will also change as data changes.
Answer:
D). energy resulting from the attraction between two masses.
Explanation:
Answer:
Explanation:
height fallen = h , initial speed u = 0
time t = 2.4s
h = 1/2 x gt²
= .5 x 9.8 x 2.4²
= 28.22 m
Speed of striking the ground
v = gt
= 9.8 x 2.4
= 23.52 m/s
A ) When rock is thrown upwards
initial velocity u = - 19 m/s
g = 9.8 m/s²
h = ut + 1/2 gt²
50 = - 19t + .5 x 9.8 t²
4.9 t² - 19 t - 50 = 0
=5.7 s
B )
V = - -u+gt
= - 19 + 9.8 x 5.7
= 36.86 m/s