A stone is dropped from a height of 10cm above the top of a window 80 cm high.the time taken by the stone to cross the window is (g=9.8 ms^(-2))

A stone is dropped from a height of 10cm above the top of a window 80

1.	A stone is dropped from a height of 10cm above the top of a window 80 cm high.the time taken by the stone to cross the window is (g=9.8 ms^(-2))
Answer» `1/7s` `3/7s` `2/7s` `4/7s` ANSWER :C