Estimate the average force that a baseball pitcher's hand exerts on a 0.145-kg baseball as he throws a 39-m/s pitch. Assume the pitcher accelerates the ball through a horizontal distance of 2.0 m, from behind his body to where the ball is released and ignore the air resistance.

55 N

Explanation:

Assuming no potential energy changes.

The work applied increases the kinetic energy.

Fd = ½mv²

F = mv²/2d = 0.145(39²) / (2(2.0)) = 55.13625 ≈ 55 N

Hello nice meet and password hai hai hai hai to this my

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

well clustered together.

points close on a scatter diagram