Fusion reactions happen in stars
Answer:
Explanation:
Given
Two springs with spring constant 
and 
(a)If they are stretched using the same force
Force 
where 
and 
are the extension in the spring
so 
therefore 
Work done is given by
thus 
(b)If they are stretched the same distance
Thus 
For same extension, work done by Force 1 is more
<span>a. bends away from the normal</span>
Answer:
v2^2 - v1^2 = 2 g s fundamental formula
v2 = v1 + 2 g = v1 + 19.8 increase in velocity in 2 sec
v1^2 + 39.6 v1 + 392 - v1^2 = 2 * 9.8 * 123.1 = 2412.76
v1 = (2412.76 - 392) / 39.6 = 51.03
v2 = 51.03 + 19.6 = 70.63
T = 70.63 / .8 = 7.207 sec time to fall height of tower
S = 1/2 g T^2 = 4.9 * 7.207^2 = 254.5 m
(Note v2^2 - v1^2 = 70.63^2 - 51.03^2 = 2385 m
2385 / (2 * 9.8) = 122 m (close to 123.1 as was given
