Prof.Jung drops an egg from 0.8 m above a table.(a) What is the velocity

题目

Prof.Jung drops an egg from 0.8 m above a table.(a) What is the velocity
of the egg right before it hits the table?(b) What is the momentum at that instance?The
mass of the egg is 50 g.(c) What is the impulse when the egg hits the table?(d) If the
time of contact between the egg and the table-top is 5 ms,what is the force exerted on the
egg by the table?(e) If the egg is dropped on to a sponge instead and thereby the contact
time is lengthened to 25 ms,what is the force exerted on the egg by the sponge and the
table?

答案

question a:according to the Law of free fall,2gh=v²,v=4m/s ,the velocity of the egg is 4m/squestion b:p=m*v=0.05*4=0.2 kg/m·squestion c:I=2mv=0.05*4*2=0.4 N·squestion d:I have no ideaquestion e...