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 Coin 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 tosse

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 Coin to hit the ground ?How fast is the coin going just before it strikes the ground? (g=10ms^(-2))
Answer» 2.70s, 20 m/s 1.70s, 30 m/s 4.70s, 50m/s 10S, 50 m/s Answer :A