An object with a mass of 20 kg has a net force of 80 newtons acting on it what is the acceleration of the object

Force = mass × acceleration

We know that the force is 80 Newtons and our mass is 20 kilograms therefore by substituting those values in our equation we have:

Therefore the acceleration is 4 m/s^2.

some think that theories become laws, but theories and laws have separate and distinct roles in the scientific method. a law is a description of an observed phenomenon in the natural world that hold true every time it is tested. it doesn't explain why something is true; it just states that it is true.

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).