A car moves with a speed of \(60\) km/h for \(1\) hour in the east direction and with the same speed for \(30\) min in the south direction. The displacement of the car from the initial position is:
1. \(60\) km
2. \(30 \sqrt{2}\)  km
3. \(30 \sqrt{5}\) km
4. \(60 \sqrt{2}\) km

A body in one-dimensional motion has zero speed at an instant. At that instant, it must have:

If a particle is moving along a straight line with increasing speed, then:

When the velocity of a body is variable, then:

1. its speed may be constant.

2. its acceleration may be constant.

3. its average acceleration may be constant.

4. All of the above

A particle moves with velocity v₁ for time t₁ and v₂ for time t₂ along a straight line. The magnitude of its average acceleration is:

1. $\frac{v_2-v_1}{t_1-t_2}$

2. $\frac{v_2-v_1}{t_1+t_2}$

3. $\frac{v_2-v_1}{t_2-t_1}$

4. $\frac{v_1+v_2}{t_1-t_2}$

A body is projected vertically in the upward direction from the surface of the earth. If the upward direction is taken as positive, then the acceleration of the body during its upward and downward journey is:

1. Positive, negative

2. Negative, negative

3. Positive, positive

4. Negative, positive

A car travelling at a speed of 30 km/h is brought to rest at a distance of 8 m by applying brakes. If the same car is moving at a speed of 60 km/h, then it can be brought to rest with the same brakes in:

1. 64 m

2. 32 m

3. 16 m

4. 4 m

A balloon starts from the ground from rest with an upward acceleration of 2 m/s². After 1 sec, a stone is dropped from it. The time taken by the stone to strike the ground is approximately:

1. 0.3 s

2. 0.7 s

3. 1 s

4. 1.4 s

Two balls are projected upward simultaneously with speeds of 40 m/s and 60 m/s. Relative position (x) of the second ball with respect to the first ball at time t = 5 sec will be: [Neglect air resistance]

1. 20 m

2. 80 m

3. 100 m

4. 120 m

Which one of the following displacement-time graph represents two moving objects \(P\) and \(Q\) with zero relative velocity?

1.		2.
3.		4.