)A ball is hit straight up with an initial speed of 50 meters per second. What is the speed of the ball 3 seconds after it is hit? [Neglect friction.]

The velocity of the ball after 3 seconds it is hit, is 20.6 m/s

Explanation:

Given;

initial velocity of the ball, u = 50 m/s

time of the upward motion of the ball, t = 3 seconds

The velocity of the ball after 3 seconds is calculated by applying the following kinematic equation;

v = u - gt

where;

g is acceleration due to gravity = 9.8 m/s²

v = 50 - (9.8 x 3)

v = 50 - 29.4

v = 20.6 m/s

Therefore, the velocity of the ball after 3 seconds it is hit, is 20.6 m/s

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures