Answer:
a. 3 m/s
Explanation:
The magnitude of the momentum of an object is given by:
where
m is the mass of the object
v is the speed of the object
For the ball in this problem, we know:
p = 12 kg m/s is the momentum
m = 4 kg is the mass
Solving the equation for v, the speed, we find:
speed at end is accn of gravity x time
9.81x12=just over98.1m/s