第四章单元测试
- A particle moves from the position
m to 
m in 2 s. What is the average velocity 
of this motion （ ）。 - A particle moves with a constant acceleration
. If its initial velocity is 
m/s, what is the velocity of the particle at t = 2 s. （ ） - For a two-dimensional velocity
, the change of velocity may happen as（ ）。 - A particle undergoes a uniform circular motion. Which of the following statements are correct.（ ）。
- For a projectile motion from the ground, the maximum lateral distance can be achieved as the launching angle is
. （ ）
A:
m/s
B:
m/s
C:
m/s
D:
m/s答案:
m/sA:
m/s
B:
m/s
C:
m/s
D:
m/s
A:change of both
and 
B:change of 
C:change of 
D:change of the angle between 
and 
A:The tangential component of acceleration is zero B:The magnitude of displacement equals to the distance for any time interval C:The magnitude of velocity equals to the speed D:The radial component of acceleration is zero
A:对 B:错
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