Choose the one alternative that best completes the statement or answers the ques

Question

Choose the one alternative that best completes the statement or answers the question. Which of the following situations is impossible? An object has constant non-zero acceleration. An object has velocity directed east and acceleration an object has zero velocity but non-zero acceleration an object has velocity directed east and acceleration directed west. An object has constant non-zero velocity and changing acceleration. A racing car accelerates uniformly from rest along a straight track. This track has markers spaced at equal distances along it from the start, as shown in the figure. The car reaches a speed of 140 km/h as it passes marker 2. Where on the track was the car when it was traveling at half this speed that is at 70 km/h? Before marker 1 Between marker 1 and marker 2 At marker 1 When a ball is thrown straight up with no air resistance, the acceleration at its highest point reverses from upward to downward reverses from downward to upward Q is downward is upward is zero SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.

Explanation / Answer

1. E . An object has constant velocity and non zero accelaration.

Because if velocity is constant, accelaration is always zero

2. B. Before marker 1

Becuse if velocity is increasing body will cover greater distances in shorter time. The same can be proved by v2-u2 = 2as formula

3. Downward.

Accelaration is always downward if object is on earth and no force is applied at that point of time

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