Answer:
The correct option is C
Explanation:
According to third equation of motion, v
2
=u
2
+2ax
Here, u=0 m/s
a=−g and x=−h
Negative sign indicates downward direction. Displacement and acceleration both are downwards.
So,v=±
2(−g)(−h)
We take minus sign because it is downwards.
v=−
2gh
After bouncing. velocity becomes 80% of v, i.e.,
v
′
=+0.8
2gh
(positive sign because the direction of ball has reversed after bouncing and is upwards.
Applying third equation of motion again, for u=v
′
, v=0 and a=−g
v
2
=u
2
+2×a×x
Thus,
0=0.64(2gh)+2(−g)x
or
x=0.64h
World shall know pain im not helping figure it out urself + RATIO
In order to answer that question, we would need to know something about the rocket's climb.
Any of these would do it:
-- its speed when it reaches 85 km
-- its acceleration on the way up
-- the time it takes to reach 85 km.
<span>the speed of something in a given direction. so i think none of these</span>
The object becomes neutralized in charge. The positive charge in the field neutralizes the negative charge in the object.