<span>B.
many wavelengths pass a given point in one second
</span>
Answer:
A time that is less than half an hour
Explanation:
it says velocity is positive so it would yield to a negative acceleration
Answer:
if an object is in free fall for a longer time its position will increase at an exponential rate because the object is accelerating
Explanation:
It is given that,
Force applied to object, 
Position,
(b) The cross product of force and position vector is used to find the net torque about the z axis. It is given by :



or

The torque is acting in -z axis.
(a) The magnitude of torque is given by :


Hence, this is the required solution.