Which statement best describes the motion of objects in free fall?

A. Objects in free fall accelerate at a constant rate toward Earth's
center,

B. Objects in free fall accelerate at an increasing rate toward Earth's
center

C. Objects in free fall start by accelerating and then travel at
constant speed toward Earth's center,

D. Objects in free fall travel at a constant speed toward Earth's center.

Natural forces that can alter ecosystems include seasons and climate changes. t or f

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.