The Answer is A becuase the piano moving up is is going in a positive way whe it stops the forces are equal then when it falls the forces are negative
Answer:

Explanation:
We are given that
Initial velocity, u=5.20m/s

We have to find the horizontal component of the initial velocity.
We know that
Horizontal component of velocity=
Using the formula
Horizontal component of the initial velocity=
Horizontal component of the initial velocity=
Horizontal component of the initial velocity=
Hence, the horizontal component of the initial velocity=
Answer:
the mass of the object, the color
The formula for half-life is:

Where A is the amount of iodine-131 initially and after 40 days, t is time, h is half-life of the isotope. Let's plug in our values to the equation:

Therefore, the patient has 0.625 grams of iodine-131 after 40 days.
Answer:
u right u right, curious what color shade that is