David is driving a steady 25.0 m/s when he passes Tina, who is sitting

Gregory Jones

Gregory Jones

Answered question

2022-01-01

David is driving a steady 25.0 m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.00 m/s2 at the instant when David passes. How far does Tina travel before David is passed, and what speed does she travel at?

Answer & Explanation

sirpsta3u

sirpsta3u

Beginner2022-01-02Added 42 answers

Write the expression for distance travelled by an object in a time t, and solve for t.
d=ut+12at2
(25 ms)t=0+12(2ms2)t2
t=25s
The distance in which Tina drive before passing David can be calculated using the equation (1).
d=0+12(2ms2)(25s)2
d=625 m
The speed of Tina when she passes David can be calculated as follows.
v=at
=(2 ms2)(25 s)
=50 ms

Eliza Beth13

Eliza Beth13

Skilled2023-05-19Added 130 answers

To solve this problem, we can use the equations of motion. Let's denote the distance traveled by Tina as x and the time taken by Tina to pass David as t.
Since David is driving at a constant speed of 25.0 m/s and Tina starts from rest, the relative velocity between them is 25.0 m/s.
Using the equation of motion for distance covered during constant acceleration:
x=v0t+12at2
where v0 is the initial velocity, a is the acceleration, and t is the time. In this case, v0=25.0m/s, a=2.00m/s2, and x is the distance traveled by Tina before passing David.
Since Tina starts from rest, her initial velocity is 0. We can rewrite the equation as:
x=12at2
Now, we need to find the time taken by Tina to pass David. Since the relative velocity between them is constant at 25.0 m/s, we can use the equation:
x=vt
where v is the relative velocity. In this case, v=25.0m/s. Rearranging the equation, we get:
t=xv
Now, substitute this value of t in the equation for x:
x=12a(xv)2
Simplifying this equation:
2x=ax2v2
Rearranging the equation:
2v2=ax
Substituting the given values:
2(25.0m/s)2=(2.00m/s2)x
Solving for x:
x=2(25.0m/s)22.00m/s2
Simplifying:
x=2(625m2/s2)2.00m/s2
x=1250m2/s22.00m/s2
x=625m2/s2×12.00m/s2
x=312.5m2/s2×1ms2
x=312.5m
Therefore, Tina travels 312.5 meters before passing David.
To find the speed at which Tina travels, we can use the equation of motion for velocity:
v=v0+at
where v0 is the initial velocity, a is the acceleration, t is the time, and v is the final velocity. In this case, v0=0m/s, a=2.00m/s2, t is the time taken by Tina to pass David, and v is the final velocity.
Substituting the value of t:
v=0m/s+2.00m/s2×(312.5m25.0m/s)
Simplifying:
v=0m/s+2.00m/s2×12.5
v=0m/s+25.0m/s
v=25.0m/s
Therefore, Tina travels at a speed of 25.0 m/s.
madeleinejames20

madeleinejames20

Skilled2023-05-19Added 165 answers

Answer:
Tina travels 156.25 m at a speed of 25.0 m/s.
Explanation:
The initial velocity of Tina, vTina, initial, is zero as she is sitting at rest. The acceleration, aTina, is given as 2.00m/s2, and the final velocity of Tina, vTina, final, is the same as David's velocity, which is 25.0m/s.
Using the equation of motion vfinal=vinitial+at, we can find the time it takes for Tina to reach the velocity of David:
vTina, final=vTina, initial+aTina·t
25.0m/s=0+2.00m/s2·t
Simplifying the equation, we have:
25.0m/s=2.00m/s2·t
To find t, we divide both sides of the equation by 2.00m/s2:
25.0m/s2.00m/s2=t
t=12.5s
Now that we have the time, we can find the distance Tina traveled during this time using the equation of motion d=vinitial·t+12a·t2:
dTina=vTina, initial·t+12aTina·t2
Substituting the known values:
dTina=0·12.5s+12·2.00m/s2·(12.5s)2
Simplifying the equation, we have:
dTina=0+12·2.00m/s2·156.25s2
dTina=156.25m
Therefore, Tina travels a distance of 156.25m before David passes her. Tina's speed at that point is the same as David's speed, which is 25.0m/s.

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