What is the difference between mass and weight

What are two different ways you could find the value of a? explain these methods.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Asailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5m/s2 for 4s. after the wind stops, the sailboat is traveling to the left with a velocity of 3.0m/s.assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind? answer using a coordinate system where rightward is positive.