The slowest animal (crab) travels at 5.70 km/yr, how long does it take to travel 80 km? Vouab
1 answer:
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Newton's second law states that the product between the mass and the acceleration of an object is equal to the force applied:
from which we find an expression for the acceleration:
(1)
Both objects are moving by uniformly accelerated motion (because the force applied is constant), so we can also using the following relationship
(2)
where
is the final speed of the object
is the initial speed
S is the distance covered
By substituting (1) into (2), and by removing (since the final velocity of the two objects is zero), we find
where we can ignore the negative sign (because the force F will bring another negative sign).
For the first object, we have
![S= \frac{(2.0 m/s)^2 (4.0 kg)}{2F} = \frac{8}{F} [m]](https://tex.z-dn.net/?f=S%3D%20%5Cfrac%7B%282.0%20m%2Fs%29%5E2%20%284.0%20kg%29%7D%7B2F%7D%20%3D%20%20%5Cfrac%7B8%7D%7BF%7D%20%5Bm%5D%20)
And for the second object we have
![S= \frac{(4.0 m/s)^2 (1.0 kg)}{2F} = \frac{8}{F} [m]](https://tex.z-dn.net/?f=S%3D%20%5Cfrac%7B%284.0%20m%2Fs%29%5E2%20%281.0%20kg%29%7D%7B2F%7D%20%3D%20%5Cfrac%7B8%7D%7BF%7D%20%5Bm%5D%20)
And since the braking force applied to the two objects is the same, the two objects cover the same distance.
from which we find an expression for the acceleration:
Both objects are moving by uniformly accelerated motion (because the force applied is constant), so we can also using the following relationship
where
S is the distance covered
By substituting (1) into (2), and by removing
where we can ignore the negative sign (because the force F will bring another negative sign).
For the first object, we have
And for the second object we have
And since the braking force applied to the two objects is the same, the two objects cover the same distance.
By definition, we have to:
Where,
F: force [N]
m: mass of the object [Kg]
a: acceleration of the object [m / s ^ 2]
Clearing the acceleration we have:
Substituting values we have:
Rounding the nearest whole we have:
Answer:
the acceleration of the ball is: