question1: a person weights 400 N on the surface of the Mars. what will the pers

Question

question1: a person weights 400 N on the surface of the Mars. what will the person weight when she is a distance of twice the radius of Mars from the center of the Mars? ( you do not need information that is not provided to answer this question)

Question 2:

A ball is thrown stright down from the top of a cliff with speed of 10 m/s. The cliff-top is 30 m above ground level. Neglect the effects of air resistance.

a) with what speed does the ball strike the ground?

b) how long is the ball in the air?

c) what is the speed of the mall when it is half-way to the ground?

Question 3:

what is meant by the parse "an ovserver in an inertial reference fram" ?

Question 4:

why do all object accelerate at the same rate when in free fall? EXPLAIN!

Explanation / Answer

aceleration due to gravity g=GM/r^2

r became twice==>g becomes becomes g/4

==>w at required distance is 400/4=100 N

2)a)v^2=10^2 +2*9.8*30

v=sq root 688=26.22 m/s

b)t=26.22/9.8

=2.67 s

c)substitute 15 in place 30 in 2a

4)because acceleration depends only on the planet where the object is present

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