Answer:
Explanation:
The vertical component of the initial velocities are
If we ignore air resistance, and let g = -9.81 m/s2. The the time it takes for the projectiles to travel, vertically speaking, can be calculated in the following motion equation
So the ratio of the times of the flights is
The basic relationship between frequency, wavelength and speed of a wave is given by
where
v is the wave speed
f is its frequency
is its wavelength
Re-arranging the equation and using the data of the problem, we find the frequency of the wave:
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: