These answers are very good. I made a 95% by using this as my answer key, but unfortunately, one of these is wrong. I don't know which one, all I know is that I got 19/20. Just wanted to throw that out there. :-) Good job, Sadaqasalaam3. And thank you.
Answer:
It will take for the lead car to stop.
Explanation:
<em>Stage 1</em>: The car moves at constant speed .
<em>Stage 2</em>: the car accelerates with (the negative sign means it's decelerating with respect to the direction is moving).
¿When will be the velocity be ?
From Kinematics:
So, if final velocity is
then,
⇒ ⇒ .
Answer:
Force,
Explanation:
We have,
Masses of two twins are 54 kg each
They are placed at a distance of 0.02 m
It is required to find the force of gravity between them. The formula used to find the gravitational force between masses is given by :
plugging all the known values:
So, the force of gravity between them is .
Answer:
Acceleration = 2.8 m/s²
Explanation:
Given the following data;
Mass = 1500 kg
Net force = 4200 Newton
To find the truck's acceleration;
Newton's Second Law of Motion states that the acceleration of a physical object is directly proportional to the net force acting on the physical object and inversely proportional to its mass.
Mathematically, it is given by the formula;
Substituting into the formula, we have;
Acceleration = 2.8 m/s²