A golf ball thrown directly upwards from the surface of the moon with an initial velocity of 20 meters per second and will attain a height of $s(t)=-0.8 t^{2}+20 t$
meters in t seconds.How fast is the golf ball going at its high point?
A)0 meters/sec
B)-0.8 meters/sec
C)20 meters/sec
D)-20 meters/sec

Question

A golf ball thrown directly upwards from the surface of the moon with an initial velocity of 20 meters per second and will attain a height of $s(t)=-0.8 t^{2}+20 t$
 meters in t seconds.How fast is the golf ball going at its high point?
A)0 meters/sec
B)-0.8 meters/sec
C)20 meters/sec
D)-20 meters/sec

Quizplus · Accepted Answer

At the high point, the velocity of the golf ball is 0 meters/sec because velocity is the derivative of the position function with respect to time, and at the maximum height, the derivative (velocity) is zero.

A Golf Ball Thrown Directly Upwards from the Surface of the Moon