Awell-thrown ball is caught in a well-padded mitt. if the deceleration of the ball is 2.10\times 10^{4} m/s^2, and 1.85 ms \left(1\: ms=10^{-3}\: s\right) elapses from the time the ball first touches the mitt until it stops, what was the initial velocity of the ball?

38.85 m/s

Explanation:

a = Acceleration = (negative sign due to deceleration)

t = Time taken = 1.85 ms

u = Initial velocity

v = Final velocity = 0

Equation of motion

Initial velocity of the ball is 38.85 m/s

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

c)as speed changes, wavelength and frequency change.

everything changes!