A baseball is traveling (+20 m/s) and is hit by a bat. It leaves the bat traveling (-30 m/s). What is the change in the velocity
2 answers:
Answer: A. 50m/s
Explanation
Step 1
The first step is to define velocity. Velocity is a measure of how fast displacement is changing with time. When discussing the velocity of a object we have to take into account that direction is important.
Step 2
The second step is to calculate the change in velocity. The object is initially travelling with a velocity of and then hits the bat, changes directions and travels at
in a direction opposite to it's initial direction. The change in velocity is calculated as shown below,
The correct answer is
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Answer:
a) v = 19,149.6 m/s
b) f = 95%
c) t = 346.5min
Explanation:
First put all values in metric units:
The equation of motion you need is:
where is the final velocity, a is acceleration and t is time in hours.
Since the spaceship starts from 0 velocity:
Next, you need to calculate the distances traveled on each interval, considering that both starting and final intervals travel the same distance because the acceleration and time are equal. For this part you need the next motion equation:
solving for first and last interval:
Since the spaceship starts and finish with 0 velocity:
Then the ship traveled at constant speed, which means that it traveled:
Which in percentage is 95% of the trip.
to calculate total time you need to calculate the time used during constant speed:
That added to the other interval times: