1. a roller coaster car rapidly picks up speed as it rolls down a slope. as it
starts down the slope, its speed is 4 m/s. but 3 seconds later, at the bottom of
the slope, its speed is 22 m/s. what is its average acceleration?
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vr
what is it’s average acceleration ?

The average acceleration, aₐ = 6 m/s²

Explanation:

Given that,

The initial speed of the roller coaster car, u = 4 m/s

The final speed of the roller coaster car, v = 22 m/s

The time taken to attain the final speed is, t = 3 s

The average acceleration is defined as the change in the final velocity to initial velocity by time.

                                        aₐ  = v - u / t         m/s²

Substituting the values in the above equation,

                                         aₐ = 22 m/s - 4 m/s  /   3 s

                                              = 6 m/s²

Hence, the average acceleration of the roller coaster is aₐ = 6 m/s²

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

object 2 because all the other ones are wrong