Question

when a ball is thrown upward, how much speed does it loose each second?

Answer 1

"g" (=9.8m/s^2)

When the ball is moving up its velocity gets reduced by 9.8 m/s in each second.

When the ball returns downward its velocity gets increased by 9.8 m/s in each second.

Answer 2

technically this is a physics question.

sylvias is correct assuming we are talking about standard gravity on earth (in other words gravity near the surface of the earth)

also ignoring friction and such

but in general, you can assume it indeed loses about 9.8 m/s^2 in upwards velocity.

Answer 3

lets be honest no on actually answers on the physics page