Asteel cable lying flat on the floor drags a 20 kg block across a horizontal, frictionless floor. a 110 n force applied to the cable causes the block to reach a speed of 4.2 m/s in a distance of 2.0 m
what is the mass of the cable?
express your answer to two significant figures and include the appropriate units.

The mass of the cable is 4.94 kg                                                                                                                                                                            

Explanation:

It is given that,

Mass of the block, m = 20 kg

Force applied to the cable, F = 110 N

Speed of the block, v = 4.2 m/s

Distance, d = 2 m

Let a is the acceleration of the block. It can be calculated using the third equation of motion as :

Let m' is the mass of the cable. It can be calculated using the second law of motion as :

m = 4.94 kg

So, the mass of the cable is 4.94 kg. Hence, this is the required solution.

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.