when a pitcher throws a baseball, it reaches a top speed of 45 m/s. if the
baseball takes 0.9 seconds to travel from the pitcher to the catcher, what is
its acceleration? (assume the ball is moving at 0 m/s right before it leaves
the pitcher's hand.)

a. 45 m/s2

b. 50 m/s2

c. 55m/s 2

d. 40 m/s2

B. 50 m/s²

Explanation:

Given:

Initial velocity of the ball is,

Final velocity of the ball is,

Time taken by the  ball is,

Acceleration is defined as the rate of change of velocity. So, the velocity of the ball is changing with time. So, acceleration is given as:

Plug in 0 for 'u', 45 for 'v', 0.9 for 't' and solve for acceleration, 'a'. This gives,

Therefore, the acceleration of the ball is 50 m/s².

Yes it does because when One of the major effects of weightlessness that is more long-term is the loss of muscle and bone mass. In the absence of gravity there is no weight load on the back and leg muscles, so they begin to weaken and shrink.