What is true for motion in a straight line.
A. if a vechile has zero velocity , it must be stationary.
B.the graph of position against time has to be a straight line.
C.acceleration is the rate of change of speed.
D.velocity is the rate of change of position.
E.a reversing vechile must have negative velocity.
F.two vechiles travelling at the same speed at the same instant of time on the same road must have the same velocity.
B. is false
F. true if they go in the same direction, false if they go in opposite direction
speed does not take into consideration the direction, whereas velocity does.
OK, I give up, what is a vechile ??
To determine what is true for motion in a straight line, let's analyze each option:
A. If a vehicle has zero velocity, it must be stationary.
This statement is true. Velocity is the rate of change of position with respect to time. If the velocity is zero, it means there is no change in position over time, which implies that the vehicle is not moving and is stationary.
B. The graph of position against time has to be a straight line.
This statement is not necessarily true. The graph of position against time can be a curve if the velocity is changing over time. However, if the velocity is constant, the graph will be a straight line.
C. Acceleration is the rate of change of speed.
This statement is true. Acceleration is defined as the rate of change of velocity. In the case of linear motion, where velocity is changing but not direction, acceleration can be considered as the rate of change of speed.
D. Velocity is the rate of change of position.
This statement is true. Velocity is defined as the rate of change of position with respect to time. It represents the speed and direction of an object's motion along a straight line.
E. A reversing vehicle must have negative velocity.
This statement is true. If a vehicle is moving in the opposite direction of the positive direction on a straight line, its velocity will be negative. Velocity is a vector quantity that includes both magnitude (speed) and direction.
F. Two vehicles traveling at the same speed at the same instant of time on the same road must have the same velocity.
This statement is true. Velocity takes into account both the speed and direction of an object's motion. If two vehicles are traveling at the same speed in the same direction on the same road, their velocities will be the same.
In summary, the statements that are true for motion in a straight line are:
A. If a vehicle has zero velocity, it must be stationary.
C. Acceleration is the rate of change of speed.
D. Velocity is the rate of change of position.
E. A reversing vehicle must have negative velocity.
F. Two vehicles traveling at the same speed at the same instant of time on the same road must have the same velocity.