F=mg=Gm1m2/r^2
g=Gm2/r^2
g=2Gm2/(2r)^2=2Gm2/4r^2=Gm2/2r^2
So since there is half times the gravity on this unknown planet that has twice earth's mass and twice it's radius, then the person can jump twice as high. 1.5*2= 3m high
        
                    
             
        
        
        
Answer:

Explanation:
Given two mass on an incline code  and
 and  and an angle of inclination
 and an angle of inclination  .
.  . Assume that
. Assume that  is the weight being pulled up and
 is the weight being pulled up and  the hanging weight.
 the hanging weight.
-The equations of motion from Newton's Second Law are:
 where a is the acceleration.
 where a is the acceleration.
#Substituting for  (tension) gives:
 (tension) gives:

#and solving for 
 which is the system's acceleration.
 which is the system's acceleration.
 
        
             
        
        
        
a yoyo in someones hand is an example of potential energy