Question

3. What average net force is required to stop a 7 kg shopping cart in 2 s if it's initially

Answer 1

-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 = $\frac{v - u}{t}$

Therefore;

     F = m x  $\frac{v - u}{t}$

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  $\frac{0- 3.5}{2}$ = -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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