Choose the one alternative that best completes the statement or answers the ques
ID: 1999100 • Letter: C
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