A girl is standing on the top edge of an 18 m high building . She tosses a coin upwards with a speed of 7.0ms^(-1). How long does it take for the join to hit the ground ? How fast is the coin going just before it strikes the ground ?(g=10ms^(2))

A girl is standing on the top edge of an 18 m high building . She toss

1.	A girl is standing on the top edge of an 18 m high building . She tosses a coin upwards with a speed of 7.0ms^(-1). How long does it take for the join to hit the ground ? How fast is the coin going just before it strikes the ground ?(g=10ms^(2))
Answer» ANSWER :`2.70 s,20ms^(-10)`