The Height of an Object T Seconds After It Is

The height of an object t seconds after it is dropped from a height of 500 meters is . Find the time during the first 4 seconds of fall at which the instantaneous velocity equals the average velocity. ​

A) 8 seconds
B) 9.8 seconds
C) 25.51 seconds
D) 2 seconds
E) 2.45 seconds