Tricky questions

## Motion In A Straight Line

- Stand out of the queue by practicing questions that most of the students get wrong
1
Most of the time students get stuck with displacement and distance while solving the problem.
A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the farmer at the end of 2 minutes.
2
Misconception regarding the direction of flow wind relative to the boat. This is a concept of relative motion between the objects.
In a harbour, wind is blowing at the speed of and the flag on the mast of a boat anchored in the harbour flutters along the N-E direction. It the boat starts moving at a speed of to the north, what is the direction of the flag on the mast of the boat?
3
Calculation of average speed, average velocity and instantaneous quantities create confusion most of the time. Let's see a problem on it.
A body is moving along a straight line. Its distance  from a point on its path at a time  after passing that point is given by , where is in meter and  is in second. The correct statement(s) is/are:
This question has multiple correct options
A
Average speed during the interval  s to is
B
Average velocity during the interval  s to is
C
The body starts from rest and at it reverses its direction of motion at from the start
D
It has an acceleration of at
4
Interpretation of distance-time graphs. Students get wrong many time while solving it.
Particles A and B are moving with constant velocities along and axis respectively, the graph of separation between them with time is
A
B
C
D
The velocity-time graph of a body is shown in figure.
This question has multiple correct options
A
The ratio of the average velocities during the intervals and is 1.
B
The ratio of the  during the intervals and is .
C
The ratio of the average accelerations during the intervals and is same as distance covered.
D
The ratio of the distance covered during the intervals and is .
5
Interpretation of velocity-time graphs. Students get wrong many time while solving it.
Two stones are thrown vertically upwards simultaneously from the same point on the ground with initial speed  m/sec and Which of the curves represent correct variation (for the time interval in which both reach the ground) of relative position and relative velocity of second stone with respect to respect to first with time (t). Assume that stones do not rebound after hitting.
This question has multiple correct options
A
B
C
D
6
Calculate distance covered/displacement in nth second in uniformly accelerated motion in one dimension. In this type of problem students have mistaken the nth second as a complete time period rather than that specific time.
A body starts from rest and moves with an uniform acceleration. The ratio of distance covered in the second to the distance covered in seconds is :
A
B
C
D
7
Interpretation of acceleration - time graph. Students get wrong many time while solving it.
The acceleration of a car started at , varies with time as shown in figure the distance travelled by the car in the is:
A
B
C
D