A girl whose mass is 50kg carries a box of mass 30kg up a flight of steps .there were 20 steps each 20cm high .she take to 16 seconds to climb up the steps. take g=10m/s. what is her weight

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation 2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!