Answer:
(D) friction from the ground changes the ball's
kinetic energy into heat
Explanation:
When a ball is roll on the ground, the electrons in the atoms on the surface of the ground push against the electrons in the atoms on the surface of your ball that is touching the ground. A rolling ball stops because the surface on which it rolls resists its motion,that is when two surfaces come in contact with each other, the surface of one tends to oppose the motion of the other. A rolling ball stops because of friction.
469.24m. An airplane flying 60m/s at a height of 300m dropped a sack of flour that stack the ground 469.24m from the point of release.
This is a example of horizontal parabolic projectile motion,and we represents this motion in the coordinate axis, which means that the velocity has components in x axis and y axis.
The equation of components on the x axis.
, where x is the distance and Vox the initial velocity before the drop
The equation of components on the y axis.
, where y is the height, and the velocity in y component before the drop is 0, reducing the equation to 
Clear t from both the equation of components on the x axis and the y axis:
and 
Equating both equations and clearing the distance x:

Substituting the values:

Answer with Explanation:
We are given that
x=-2.6 cm to x=2.6 cm
Linear charge density=

Length of wire=
Length of wire=
1 m=100 cm
We know that
a.Linear charge density=
Where Total charge =Q
Length=L
Total charge,Q=
Using the formula
Total charge,Q=
b.y=4 cm=
1 m=100 cm
Electric field on the y-axis is given by


Using the formula


c.y=12 cm=
Using the formula

