Answer:
a. 0.882 N b. 9.8 m/s² c. 6.42 m/s
Explanation:
a. The net force acting on the ball is its weight W = mg were m = mass of ball = 90 g = 0.090 kg and g = acceleration due to gravity = 9.8 m/s²
W = mg = 0.090 kg × 9.8 m/s² = 0.882 N
b. The acceleration = g = acceleration due to gravity = 9.8 m/s² since it is falling freely
c. Using v² = u² + 2as where v = final velocity of ball, u = initial velocity of ball = 0 m/s, a = acceleration of ball = 9.8 m/s² and s = height = 2.1 m. Substituting the values of the variables, we ave
v² = u² + 2as = 0² + 2(9.8 m/s²) × 2.1 m = 41.16
v = √41.16 = 6.42 m/s
