A student does 50 J of work to lift their backpack 0.65 meters in the air. What is the weight of the backpack? (OPTIONAL)

What is the MASS of the backpack from the previous question?

If you have a bowl with six apples and you take away four, how many do you have? anyone take a guess and post it. lol getting rid of my account might as well do it with some fun

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

If a balloon is taken outside on a very cold day, what will occur?