Formula difficulty: v² = u² + 2as, given u = 0, a = 2, s = 16

[James5x5x]

Formula difficulty: v² = u² + 2as, given u = 0, a = 2, s = 16

My textbook is telling me the answer should be 8 but I'm getting 64. If anyone could tell me where I'm going wrong I'd appreciate it. Thanks.

v² = u² + 2as

u = 0
a = 2
s = 16

 

[Deleted member 4993]

My textbook is telling me the answer should be 8 but I'm getting 64. If anyone could tell me where I'm going wrong I'd appreciate it. Thanks.

v² = u² + 2as

u = 0
a = 2
s = 16

v² = 64 → v = √(64) = 8

 

[HallsofIvy]

My textbook is telling me the answer should be 8 but I'm getting 64. If anyone could tell me where I'm going wrong I'd appreciate it. Thanks.

v² = u² + 2as

u = 0
a = 2
s = 16

v² = 0² + 2(2)(16)= 4(16)= 64.

Now, what was the question? If the question was "what is v?" then apparently you forgot to take the square root. And, actually there are two answers. Both v= 8 and v= -8 have the property that v² = 64.

 

[James5x5x]

Thanks a lot.