<span>the picture bellow gives you all the answers, this picture was given to my class by my science teacher a few years ago so it is accurate
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heat = mass x spec heat x temp rise
40.5=15.4x10^-3xspec heatx11.2
The answer is A ..........
For this question we should apply
a = v^2 - u^2 by t
a = 69 - 0 by 4.5
a = 69 by 4.5
a = 15.33
a = 6.85 m/s^2
If the answer in option is near to answer then , you can mark it as correct.
.:. The acceleration is 6.9 m/s^2