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Physical Science I Need Help On How To Do The Math

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Physical Science Forces : Homework # 1
1 ) What will be the final velocity of an object that falls from rest , if it falls for 5 seconds ?
2 ) How many seconds of time does it take an object dropped from rest to reach a final velocity of
30 meters / second ?quot;
3 ) What will be the final speed of an object that’s dropped from rest if it falls for 4 seconds ?
4 ) How many seconds are needed for an object dropped from rest to reach a final velocity of 98
meters / second ?
5 ) Two students are pushing on a box in the same direction , and one other student is pushing on a
box in the opposite direction . What is the net force on the box if each pushes with – a force of 50 N ?
5 ) You are an international spy and just jumped off an airplane to escape your pursuers . If the
downward force of gravity and the upward force of air resistance on you are both 350 N , are you
still falling toward the ground ? Explain .
7) You are trying to push a couch from one corner of your room to another . You push , but the
couch doesn’t move . What force prevents you from pushing the couch across the room ? Explain
how it works .
8 ) Why do feathers , leaves , and pieces of paper fall more slowly than pennies , acorns , and apples ?!Science