An apple hits the ground in 4 seconds. What is its final speed?

Kinematic equation  Vf=Vo +a*t

Explanation:

in meters per second

V=9.8 * 4

V= 39.2 m/s

What grade?? I’m not sure if this will help for your grade.

Explanation:

Multiply the time by the acceleration due to gravity to find the velocity when the object hits the ground. If it takes 9.9 seconds for the object to hit the ground, its velocity is (1.01 s)*(9.8 m/s^2), or 9.9 m/s.

newton's first law of motion

b.transmitters send radio waves, and receivers capture radio waves.