Why will the cart move backwards? Please elaborate

Dear Student

Such questions  are  made  for enhancing the  self creative  skills  and  should  be  tried answering  on your own. However,  here  are  a  few  points  that  will  help you in  framing your answer: 

Yes, in this case each of them receives an instantaneous reaction as a result of throwing the sand bag. This activity explain Newton’s 3rd law of motion i.e., the force is exerted forward in throwing the bag full of sand and the person who is throwing it gets pushed backward.
If skate boards were used then they would have fallen from the skateboards and it will affect the observation .Thus here the skate boards are not used .

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