Answer:
The function that describes the height of the ball in time is 
.
Step-by-step explanation:
Let suppose that ball experiments a free fall motion, which means that the ball is accelerated because of gravity and gravitational acceleration can be considered constant since height reached by the object is too small in comparison with the radius of the Earth. Therefore, we can assume that ball is accelerated uniformly.
Hence, the kinematic formula for the height of the ball (
), in feet, is described below:
(1)
Where:
- Initial height with respect to the ground, in feet.
- Initial velocity, in feet per second.
- Time, in seconds.
- Gravitational acceleration, in feet per square second.
If we know that 
, 
and 
, then the function that describes the height of the ball in time is:
(2)
Answer:
r < 4/7
Step-by-step explanation:
35r - 21 < -35r + 19
35r + 35r < 19 + 21
70r < 40
r < 4/7
Answer:
5 mph north
Step-by-step explanation:
The relative velocity of the truck with respect to the car is ...
relative velocity = truck velocity - car velocity
relative velocity = 42 mph north - 37 mph north
relative velocity = 5 mph north
