A projectile fired from the ground follows a parabolic path. At what position will the speed of projectile be minimum?
A.
At the top of the path
B.
At the beginning of the path
C.
While travelling along the path
D.
None of Above
Answer: Option A
Explanation:
The speed of the projectile will be minimum at the top of the path. This is because a horizontal component of velocity will remain constant throughout the motion whereas the vertical component of the velocity is zero at the top.
Three particles A,B and C are projected from the same point with the same initial speed making angles 30°,45° and 60° respectively with the horizontal. Which of the following statements is correct?
A.
A, B and C have unequal ranges
B.
Ranges of A and C are equal and less than that of B
C.
Ranges of A and C are equal and greater than that of B
A body executing uniform circular motion has at any instant is velocity vector and acceleration vector?
A.
Along the same direction
B.
In opposite direction
C.
Normal to each other
D.
Not related to each other
Answer: Option C
Explanation:
Velocity is along the tangent to the circular path and acceleration vector is along the radius. Thus a body executing uniform circular motion at any instant has velocity vector and acceleration vector normal to each other.
