A rectangular box rests on a flat surface and has weight of 100N. Calculate the total weight if another body is placed on it and the pressure on the surface of the base is 60N/m2 if it has an area of 2m2. Answer needed urgently pls​

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.

What happens when you slowly pulled the carboard?

Which wave is the result of amplification and produces a louder sound