# 1 A 20 kg rock is on the edge of 100 cm cliff a) what potential energy does th

Question

# 1 A 20 kg rock is on the edge of 100 cm cliff a) what potential energy does the rock process relative to thebase of the cliff? b) The rock falls from the cliff. What is its kenetic energyjust before it strikes the ground? c) what speed does the rock have as it strikes theground? #2 An archer pouts a 3 kg arrow to the bowstring. An averageforce of 201 N is exerted to draw the string back 1.3 m a) assuming that all the energy goes into the arrow, with whatspeed does the srrow leave the bow? b) I f the arrow is shot straighted up, hot high does itrise? #3 Megan 's mass is 28 kg. She climbs the 4.8 m ladder of a slideand reaches a velocity of 3.2 m/s at the bottom of the slide. Howmuch work was done by the fricton on Megan? Thank you so much.
# 1 A 20 kg rock is on the edge of 100 cm cliff a) what potential energy does the rock process relative to thebase of the cliff? b) The rock falls from the cliff. What is its kenetic energyjust before it strikes the ground? c) what speed does the rock have as it strikes theground? #2 An archer pouts a 3 kg arrow to the bowstring. An averageforce of 201 N is exerted to draw the string back 1.3 m a) assuming that all the energy goes into the arrow, with whatspeed does the srrow leave the bow? b) I f the arrow is shot straighted up, hot high does itrise? #3 Megan 's mass is 28 kg. She climbs the 4.8 m ladder of a slideand reaches a velocity of 3.2 m/s at the bottom of the slide. Howmuch work was done by the fricton on Megan? Thank you so much.

Explanation / Answer

#1 a) PotE=mgh=20*9.8*1=196 J B)PoE=Ekin=196J C) V=2gh=4.42m/s #2 a) F=ma a=201/3=67m/s^2 v=2ad=13.2m/s

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