(Multiple Choice)

(1)

At t = 0, object A is dropped from the roof of a building. At the same instant, object B is dropped from a window 10 m below the roof. During their descent to the ground the distance between the two objects 

(a) Is proportional to t. 

(b) Is proportional to t₂. 

(c) Decreases. 

(d) Remains 10 m throughout.

(2)

A Porsche accelerates uniformly from 80.5 km/h (50mi/h) at t = 0 to 113 km/h (70mi/h) at t = 9 s. Which graph in Figure best describes the motion of the car?

(3)

An object is dropped from rest. If the time during which it falls is doubled, the distance it falls will

(a) Double, 

(b) Decrease by one-half, 

(c) Increase by a factor of four, 

(d) Decrease by a factor of four, 

(e) Remain the same.

(4)

A ball is thrown upward with an initial velocity v₀. Its velocity halfway to its highest point is 

(a) 0.5v₀,

(b) 0.25v₀, 

(c) v₀, 

(d) 0.707v₀, 

(e) Cannot be determined from the information given.

(5) True / False

(a) The equation Δx = v₀t + ½at²  is valid for all particle motion in one dimension. 

(b) If the velocity at a given instant is zero, the acceleration at that instant must also be zero. 

(c) The equation ∆x = v_avΔt holds for all motion in one dimension.

(6)

If an object is moving at constant acceleration in a straight line, its instantaneous velocity halfway through any time interval is 

(a) Greater than its average velocity. 

(b) Less than its average velocity. 

(c) Equal to its average velocity. 

(d) Half of its average velocity. 

(e) Twice its average velocity.

(7)

On a graph showing position on the vertical axis and time on the horizontal axis, a straight line with a negative slope represents 

(a) A constant positive acceleration. 

(b) A constant negative acceleration. 

(c) Zero velocity. 

(d) A constant positive velocity. 

(e) A constant negative velocity.

Transcribed Image Text:

(a) (b) (c) (d) (e)