Question

an object of mass 2 kg is sliding with a velocity of 4 metre per second on a frictional horizontal surface the retarding force necessary to stop the object in one second​

Answer 1

Answer:

8 Newton

Explanation:

The acceleration required is

a = Change in velocity / Time

= (0 m/s - 4 m/s) / (1 s)

= -4 m/s²

(Negative sign indicates that acceleration is in the direction opposite to that of motion of object)

Force = ma

= 2 kg × (-4 m/s²)

= -8 kg m/s²

= -8 N

(Negative sign indicates that force should be applied in the direction opposite to that of motion of object).

∴ Retarding force = 8 N

Answer 2

Answer:. -8 is the correct answer

Explanation:u=0m/s

A=v-u/t

=0-4/1

=-4 so,there is a negative acceleration or(retardation)

Now,Force=mass×acceleration

F=2×-4

F=-8

Answer.........