Question

A dolphin is swimming underwater toward the surface at 7.7 m/s. If the dolphin stops when it reaches the surface 2.3 seconds later, what is the average acceleration of the dolphin?

5.4 m/s2

-3.3 m/s2

0.30 m/s2

-5.4 m/s2
@irishboy123

Answer 1

acceleration = change in velocity per unit time

so, over 2.3 sec it goes from 7.7 to zero

Answer 2

and it slows down, so acceleration must be negative, or so you might imagine

Answer 3

so its b or d? @IrishBoy123

Answer 4

\( - \dfrac{7.7}{2.3}\)

Answer 5

-3.3 @IrishBoy123

Answer 6

sure

hardly exact though, is it?

Answer 7

its -3.34782 @IrishBoy123

Answer 8

indeed!