Why is the acceleration the same between a tennis ball and a cannon ball?
The acceleration is the same between a tennis ball and a cannon ball because they both experience the same gravitational force. According to Newton's second law of motion, the force acting on an object is equal to the mass of the object multiplied by its acceleration (F = m * a). Since the force of gravity acting on both the tennis ball and the cannon ball is the same (assuming they are at the same location on Earth), and the mass of the tennis ball and the cannon ball are different, the acceleration of both objects will be the same.
To calculate the acceleration, you can use Newton's second law equation, which states that acceleration is equal to the force divided by the mass (a = F / m). In this case, the force is the weight of the object, which is equal to the mass of the object multiplied by the acceleration due to gravity (9.8 m/s^2 on Earth). Therefore, the acceleration of the tennis ball and the cannon ball will be the same, provided there are no other external forces acting on the objects.