15. the velocity of an object fired directly upward is given by v = 20 – 9.8t, where t is time in seconds. write an inequality which could be used to describe when the velocity will be between 10 and 20 meters per second. (see ex. 8) explain to verify your choice. 10 > 20 – 9.8t > 20 10 > 20 – 9.8t or 20 – 9.8t < 20 10 < 20 – 9.8t or 20 – 9.8t < 20 10 < 20 – 9.8t < 20

Step-by-step explanation:

we are given

The velocity of an object fired directly upward is given by

where t is time in seconds

Since, velocity is velocity is between 10m/s and 20m/s

so, velocity is greater than 10 and less than 20

so, we can write our inequality as

now, we can plug v

and we get

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)