The acceleration of a baseball pitcher's hand as he delivers a pitch is extreme. for a professional player, this acceleration phase lasts only 50 ms, during which the ball's speed increases from 0 to about 90 mph, or 40 m/s.

116 N

Explanation:

Missing question: (found on google)

"What is the force of the pitcher's hand on the 0.145 kg ball during this acceleration phase?

Express your answer with the appropriate units."

Solution:

First of all, we need to calculate the acceleration of the ball, given by

where

v = 40 m/s is the final velocity

u = 0 is the initial velocity

is the duration of the acceleration phase

Substituting,

Now we can find the force exerted on the ball by using Newton's second law:

where

m = 0.145 kg is the mass of the ball

a is the acceleration

Substituting,

explanation:

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i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles