The vertical displacement of a block A in meter is given by `y=t^(2)//4` where t is in second. The downward acceleration `a_(B)` of a block B ( in `m//s^(2)`) is

Options

A. 4
B. 8
C. 10
D. 5

Answer

A

Explanation

`a_(A)=(d^(2)y)/(dt^(2))=1/2`
`a_(B)=8a_(A)` by constrained relation