Question

I need help with the following questions. Thank you!
1) A rock

is tossed straight up with a speed of 20 m/s. When it returns, it falls into a hole 11 m deep.

(a) What is the rock’s velocity as it hits the bottom of the hole?

___________ m/s (downward) 

(b) How long is the rock in the air, from the instant it is released until it hits the bottom of the hole?

___________ s

2)A snowboarder on a slope starts from rest and reaches a speed of 3.6 m/s after 7.7 s.

(a) What is the magnitude of the snowboarder’s average acceleration?

____________ m/s²

(b) How far does the snowboarder travel in this time?

 __________m

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