student measures the speed of a trolley. At one instant, the speed of the trolley is 1.0 m/s and two seconds later the speed is 4.0 m/s. What is the acceleration of the trolley? A. 1.5 m/s2 B. 2.0 m/s2 C. 2.5 m/s2 D. 5.0 m/s2
Displacement, Velocity and Acceleration
In classical mechanics, kinematics deals with the motion of a particle. It deals only with the position, velocity, acceleration, and displacement of a particle. It has no concern about the source of motion.
Linear Displacement
The term "displacement" refers to when something shifts away from its original "location," and "linear" refers to a straight line. As a result, “Linear Displacement” can be described as the movement of an object in a straight line along a single axis, for example, from side to side or up and down. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Linear displacement is usually measured in millimeters or inches and may be positive or negative.
1. A student measures the speed of a trolley. At one instant, the speed of the trolley is 1.0 m/s and two seconds later the speed is 4.0 m/s. What is the acceleration of the trolley?
A. 1.5 m/s2
B. 2.0 m/s2
C. 2.5 m/s2
D. 5.0 m/s2
2. A car driver takes a total two hours to make a journey of 75 km. She has a coffee break of half an hour and spends a quarter of an hour stationary in a traffic jam.
At what average speed must she travel during the rest of the time if she wants to complete the journey in the two hours?
A. 38 km/h
B. 50 km/h
C. 60 km/h
D. 75 km/h
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