# CBSE Class 11-Physics: Motion in One Dimension Assignment 1

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**Question 1:**

A particle moves in a straight line according to the relation

Find the acceleration of the particle at displacement equal to zero.

(a)

(b)

(c)

(d)

**Answer:**

(a)

**Question 2**

A body starts at initial velocity v_{0} in a straight line with acceleration as shown below in the graph. Find the maximum velocity reached.

(a)

(b)

(c)

(d)

**Answer:**

(b)

**Question 3**

A particle moves in a straight line with acceleration described by equation given below

If the initial velocity and displacement are and at any time t_{0} velocity and displacement are the value of constant is

(a)

(b)

(c)

(d)

**Answer:**

(a)

**Question 4**

The radius vector of point relative to origin varies with time as where a and b are constants and **i** and **j** are vectors along x and y axis. Which one of the following is the mean velocity vector?

(a)

(b)

(c)

(d)

**Answer:**

(d)

**Question 5**

A boat moves with the stream of water from point A and B and it return with the same speed. Velocity of boat relative to water is times the velocity of the water. Velocity of the water is . Find out the average speed in the whole ternary

(a)

(b)

(c)

(d) None of these

**Answer:**

(a)

**Question 6**

A body is freely falling under the action of gravity. It covers half the total distance in the last second of its fall. If it falls for n second, then then value of n is

(a)

(b)

(c)

(4)

**Answer:**

(b)

**Question 7**

Two particle A and B start with the same velocity at .They are accelerated per the graph shown above. Which particle has the maximum magnitude of the velocity at

(A) A

(B) B

(C) A & B will have same velocity

(D) None of the above

**Answer:**

(B) B

**Paragraph type question**

A Man drops a stone from the fifteen floor of the building. A Man Y ascending in an elevator at a constant speed passed the Fifteen floor just as the stone is released

**Question 8**

Find the position, velocity of the stone as seen by the Man at time

a.

b.

c.

**Answer:**

b.

**Question 9**

Find the position, velocity of the stone relative to Man Y at sec

a.

b.

c.

d.

**Answer:**

c.

**Question 10**

Find the acceleration of the stone with respect to Man X and Y.

a.

b.

c.

d. None of these

**Answers**

a.