Question

In Heather's physics class, she had to solve the equation 7=12at2+ut for u.

Which equation correctly solves for u?

Answer 1

Answer: bottom left

Explanation:

Answer 2

B (7 -1/2 at^2)/t = u

Explanation:

7 = 1/2 at^2 + ut

subtract 1/2 at^2 from each side

7 -1/2 at^2 = 1/2 at^2 + ut - 1/2 at^2

7 -1/2 at^2 = ut

divide by t

(7 -1/2 at^2)/t = ut/t

(7 -1/2 at^2)/t = u