A hypothesis is a set statement which is based upon presumption after observing the natural process. It is the part of the scientific method. It is based on the limited evidences and ideas. A testable hypothesis is the one which can be answered using suitable experimental process.
Does all wood float in water? is the correct option as it can be answered using suitable experimental procedure.
The law of reflection states that the angle of incidence is equal to the angle of reflection. Furthermore, the law of reflection states that the incident ray, the reflected ray and the normal all lie in the same plane.
There are two forces acting on the ball, one directed upward (assuming this direction as positive, along the y-axis) which is the tension on the string (lifting force), and another aimed downward, which is the attractive force due to gravity.
Applying the Newton's Universal Law of Gravitation to a mass close to the surface of the Earth (in this case the ball), we can take the acceleration due to gravity like a constant, that we call by convention g, equal to -9.8 m/s2.
So, we can write the following expression for Fg:
b)
The net force on the ball, will be just the difference between the lifting force (32.6 N) and the force due to gravity, Fg:
c)
According Newton's 2nd Law, the acceleration caused by a net force on a point mass (we can take the ball as one) is given by the following expression: