A1420-kg car is traveling with a speed of 12.4 m/s. what is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 78.0 m?

1419.01436 N

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

The force on the car

Magnitude of the horizontal net force that is required to bring the car to a halt is 1419.01436 N

So net force will be F = 1420×0.985 = 1399.61 N              

Explanation:

We have given mass of the car m = 1420 kg

Initial velocity of the car u = 12.4 m/sec

As the car finally stops final velocity v = 0 m/sec

Distance after which car is halt s = 78 m

Now according to third equation of motion

Magnitude of acceleration

So net force will be F = 1420×0.985 = 1399.61 N

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it