Kinematics_Ras

Your house is located 0.25 mile from the store. you walk from your house to the store and back. which of the following statements about your trip is true?

• The distance is 0.5 mile, and the displacement is 0.5 mile.

• The distance is 0.5 mile, and the displacement is 0.0 mile

• The distance is 0.0 mile, and the displacement is 0.5 mile

• The distance is 0.0 mile, and the displacement is 0.00 mile

Which of the following is completely specified by a single value with an appropriate unit and has no direction?

• Scalar quantity

• Vector quantity

• Both scalar and vector quantities

• Neither scalar nor vector quantities

A car moving on a straight-line path covers a distance of 2 km due east in 100s, the speed and velocity of the car are respectively

• 20 m/s , 20 m/s

• 20 m/s , 20 m/s due south

• 20 m/s due east , 20 m/s

• 20 m/s , 20 m/s due east

A car is traveling north at 17.7 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the car's average acceleration vector.

• • -0.3 m/s²

• 2.65 m/s²

• • 0.3 m/s²

• -2.65 m/s²

An object moves in the x-y plane. The x- coordinate of the object as a function of time is given by the following equation: x(t) = 4.9t² + 2t + 1. what is the x - component of the velocity vector in funtion of time?

• v_x(t) = 9.8t + 2

• v_x(t) = 4.9t + 2

• v_x(t) = 9.8t + 2 + 1

• v_x(t) = 9.8t + 2t

An object moves in the x-y plane. The x- coordinate of the object as a function of time is given by the following equation: x(t) = 4.9t² + 2t + 1. what is its acceleration vector at t = 2s?

• a_x = 9.8 m/s²

• a_x = 2 m/s²

• a_x = - 9.8 m/s²

• a_x = 4.9 m/s²

An object is moving following x(t) = -3t² - 0.5t . The displacement of this object between [0,1] s is

• 3.5 m

• -3.5 m

• 0 m

• 1 m

An object is moving following x(t) = -3t² - 0.5t . The displacement of this object between [0,1] s is

• 3.5 m/s

• • -3.5 m/s

• 0 m/s

• 1 m/s

An object is moving following x(t) = -3t² - 0.5t . The velocity at t = 2s

• V(2) = -12.5 m/s

• V(2) = -12 m/s

• V(2) = -6 m/s

• V(2) = -6.5 m/s

An object is moving following x(t) = -3t² - 0.5t . Find the acceleration at t = 2s

• a = - 11.5 m/s²

• a = - 12.5 m/s²

• a = - 12 m/s²

• a = -6 m/s²