Lila is a track and field athlete. She must complete four laps around a circular track. The track itself is a 400 meter track an
1 answer:
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Answer:
(a) Total time = 105.5 sec
(b)average speed = 31.26 m/sec
Explanation:
We have given that three-wheeled car starts from rest that initial velocity u = 0 m/sec
Final velocity = 35 m/sec
Acceleration
According to first law of motion we know that v = u+at
So
t = 17.5 sec
After this car travels 83 sec at a constant speed and after that it takes 5 sec additional time to stop
(a) So total time in which car is in motion = 17.5+83+5 = 105.5 sec
(b) Total distance traveled during first 17.5 sec
Distance traveled in 83 sec with with velocity of 35 m/sec =
For next 5 second
Initial velocity u = 35 m/sec
Final velocity = 0 as finally car stops
So
Distance traveled
So total distance traveled = 306.25+2905+87.5 = 3298.75 m
Total time = 105.5 sec
So average speed
The time of flight depends only on the initial velocity and the initial height
Explanation:
An object is said to be in free fall if the only force acting on it is the force of gravity. If this is the case, then the motion of the object in free fall is a uniformly accelerated object, with constant acceleration towards the ground. The time of flight can be found by using the suvat equation:
where
s is the displacement (which corresponds to the initial height of the object)
u is the initial vertical velocity
is the acceleration
t is the time of flight
Therefore, from the equation, we see that the time of flight depends only on two factors:
- s, the initial height of the object
- u, its initial velocity
In case the air resistance is not negligible, then the acceleration is no longer constant, and the time of the fall also depends on other factors such as the mass of the object and its shape, which affects the magnitude of the air resistance acting on the body.
Learn more about free fall:
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