Hi  

v ²= u ² + 2as

Find u when: v= -13, a= -4, s = -15

169 = u^2 + 120

49 = u^2

u = ±  7 

Wish You the Best in your Studies.

 

Answer by ikleyn(52880)   (Show Source): You can put this solution on YOUR website!
 .





The correct answer is  THIS :







            There are two solutions for u:       1)    u= 7,       and       2)    u= -7.







 

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