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

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
Answer» `1/7 s ` `3/7 s ` `2/7 s ` `4/7 s ` ANSWER :C