The velocity of a body moving with a uniform acceleration of 2 m/sec2 is 10 m/sec. Its velocity after an interval of 4 sec is
1. 12 m/sec
2. 14 m/sec
3. 16 m/sec
4. 18 m/sec
The initial velocity of a body moving along a straight line is 7 m/s. It has a uniform acceleration of 4 m/s2. The distance covered by the body in the 5th second of its motion is
1. 25 m
2. 35 m
3. 50 m
4. 85 m
The velocity of a body depends on time according to the equation . The body is undergoing
1. Uniform acceleration
2. Uniform retardation
3. Non-uniform acceleration
4. Zero acceleration
Which of the following four statements is false?
1. A body can have zero velocity and still be accelerated.
2. A body can have a constant velocity and still have a varying speed.
3. A body can have a constant speed and still have a varying velocity.
4. The direction of the velocity of a body can change when its acceleration is constant.
The position of a particle moving in the XY plane at any time t is given by metres. Select the correct statement about the moving particle from the following.
1. The acceleration of the particle is zero at t = 0 second
2. The velocity of the particle is zero at t = 0 second
3. The velocity of the particle is zero at t = 1 second
4. The velocity and acceleration of the particle are never zero
If body having initial velocity zero is moving with uniform acceleration 8 m/sec2 , then the distance travelled by it in fifth second will be
1. 36 metres
2. 40 metres
3. 100 metres
4. Zero
An alpha particle enters a hollow tube of 4 m length with an initial speed of 1 km/s. It is accelerated in the tube and comes out of it with a speed of 9 km/s. The time for which it remains inside the tube is
1.
2.
3.
4.
Two cars A and B are travelling in the same direction with velocities v1 and v2 . When the car A is at a distance d behind car B, the driver of the car A applied the brake producing uniform retardation a. There will be no collision when-
1.
2.
3.
4.
A body of mass 10 kg is moving with a constant velocity of 10 m/s. When a constant force acts for 4 seconds on it, it moves with a velocity 2 m/sec in the opposite direction. The acceleration produced in it is
1. 3 m/sec2
2. –3 m/sec2
3. 0.3 m/sec2
4. –0.3 m/sec2