An empty truck traveling at 10 km/h has kinetic energy. How much kinetic energy does it have when loaded so that its mass and it
1 answer:
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-12.25N
Explanation:
Given parameters:
Mass of shopping cart = 7kg
Time = 2s
initial velocity = 3.5m/s
Unknown:
Average net force required to stop the cart = ?
Solution;
According to newton's second law"acceleration of body results when a net force acts on a body".
F = ma
where F is the force
m is the mass
a is the acceleration
Acceleration is the change in velocity with time
a =
Therefore;
F = m x
v is the final velocity, in this case it is zero, 0
u is the initial velocity
t is the time taken
Putting in the parameters:
F = 7 x = -12.25N
This force that will stop the cart will be directed in the opposite direction with a magnitude of 12.25N
Learn more:
Newton's law brainly.com/question/11411375
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Explanation:
It is given that, two objects, with masses m₁ and m₂, are originally a distance r apart, and the magnitude of the gravitational force on each one is F. If the objects are moved a distance 2 r apart, we need to find the new gravitational force.
The gravitational force is given by :
...........(1)
Let the force is F' when the objects are moved a distance 2 r apart. So,
(from equation (1))
So, it is clear that the magnitude of new force is F/4 i.e. decreases by a factor is 1/4. Hence, this is the required solution.