The Height of an Object T Seconds After It Is $s ( t ) = - 4.9 t ^ { 2 } + 550$

Multiple Choice

The height of an object t seconds after it is dropped from a height of 550 meters is $s ( t ) = - 4.9 t ^ { 2 } + 550$ . Find the average velocity of the object during the first 7 seconds.

A) $\quad 34.30 \mathrm {~m} / \mathrm { sec }$
B) $- 34.30 \mathrm {~m} / \mathrm { sec }$
C) $- 49.00 \mathrm {~m} / \mathrm { sec }$
D) $49 \mathrm {~m} / \mathrm { sec }$
E) $- 16.00 \mathrm {~m} / \mathrm { sec }$