With decreasing speed. The three balls shown are dropped from a bench.
8
aluminium
lead
wood
Which balls have the same acceleration?
А
B
aluminium and lead only
aluminium and wood only
lead and wood only
aluminium, lead and wood
с
D

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

This is one type of line graph in which the independent variable is time plotted on the x axis and the dependent variable, also numerical, is plotted on the y axis.

What kind of simple machine is a catapult?