Why is it easier to swim in salty water than in fresh water?

Salty Water

Explanation:

Swimming in Salty water gives us more buoyancy when freshwater does not.

The salt adds mass to the water and makes it more dense, therefore you are able to float a little more than that of freshwater, as there is no salt in there. The denser the water, the more ability you have to float in it.

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle