A block of wood of mass 5kg is pulled on a platform by a force of 40N as illustrated in the diagram above. If the frictional force, F experienced by the block is 12N, calculate the magnitude of the acceleration of the acceleration of the block
-
A.
2.4ms-2 -
B.
5.6ms-2 -
C.
8.0ms-2 -
D.
2.4ms-2
Correct Answer: Option B
Explanation
F + Ma = P
a = (frac{P – F}{m})
= (frac{40 – 12}{5} = 5.6ms^{-2})