Alex stands on the edge of shs building with a H=101.2m , dropping a tennis ball straight down horizontal , with a velocity of 25m/s on the horizontal ground , Arval is speeding up to catch the ball 4m/s trying to catch the ball. if lester stands 1.2 , and start at x meters away from the drop point , what does x need to be for him to successfully catching the ball?

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

The rocket is fired vertically and tracked by the radar station shown. when θ reaches 66°, other corresponding measurements give the values r = 32700 ft, r¨ = 85 ft/sec2, and θ˙ = 0.019 rad/sec. calculate the magnitudes of the velocity and acceleration of the rocket at this position.