Question

Please answer the image below

Answer 1

i think it is -26 ft/per sec

Answer 2

Explanation:

Remark

This is one of those questions whose answer is hidden by the sloppiness of the wording. You don't really know what the starting speed is at 129 feet. I am going to assume the submarine is constantly moving at the same speed.

Givens

d1 = 129

d2 = 229

t = 3 sec

formula

(d2 - d1) = r * t

solution

(229 - 129) = r * t

100 = r * 3

100/3 = r

33.3 feet/s = r

Caution

if you know what d = vi*t + 1/2*a * t^2 is, you could get this wrong. If you do know the formula, leave a comment below my answer.