An object has a mass of 60 kg. It decelerates from 50 m/s to 20 m/s when a resultant force of 300 N acts on it. For how long does the force act? A 0.071 s
B 0.17 s
C 6.0 s
D 14 s​

What is the length x of the side of the triangle below? (hint: use the cosine function)

Why does the equilibrium position of the spring change when a mass is added to the spring? will the mass oscillate around the new equilibrium position of the spring or the previous position without a mass attached to the spring? if the equilibrium position of the spring changes by 20 cm (assuming no initial mass) when a mass is added to the spring with constant 4.9 kg/s^2, what is the mass of the object attached to the spring?

What are known as the properties of substances that describe a substance et does not change that substances?