Answer: 26.84 m/s
Explanation:
Given
Original frequency of the horn
Apparent frequency
Speed of sound is
Doppler frequency is
Where,
Insert values
Thus, the speed of the car is
After dinner, Joanne did not put the leftover casserole away until after watching her favorite television show. What is the long
1 answer:
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The initial velocity is
Explanation:
The motion of the ball is a projectile motion, therefore it consists of two independent motions:
- A uniform motion (constant velocity) along the horizontal direction
- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction
In this problem, we just need to analyze the horizontal motion: the horizontal velocity is constant, therefore the horizontal distance travelled is given by
where
is the horizontal velocity
t is the time of flight
Here we have:
t = 0.45 s
x = 3.0 m
And so solving for , we find
And since the ball was initially projected horizontally, this is also the initial velocity.
Learn more about projectile motion:
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