Asoftball, of mass m = 0.195 kg, is pitched at a speed v0 = 25.3 m/s. due to air resistance, by the time it reaches home plate it has slowed by 11.9%. the distance between the plate and the pitcher is d = 13.7 m. calculate the average force of air resistance, fair, that is exerted on the ball during its movement from the pitcher to the plate.

Explanation:

To give this problem a solution, it is necessary to use the kinematic equations. The equation that describes velocity as a function of acceleration is given by,

Since there is a loss of 11.9%, in the final speed, that is to say that of the total speed, only 88.1% is the effective one, so

Re-arrange to find a,

Applying Newton's second law we have now that

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me