What is the velocity of the object at t=8s and all other 5 questions in the picture

the force required to move the cart is divided by three or 33.33 n.

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

i don't know that i agree with that but what's the question ?

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d