A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10 s. Then the coefficient of friction is (Take )
1
0.06
2
0.03
3
0.04
4
0.01
Official Solution
Correct Option: (3)
Step 1: Using the Equation of Motion.
The frictional force , where is the normal force. Using the equation of motion for stopping:
Solving for acceleration . The frictional force is . The coefficient of friction is:
Step 2: Conclusion.
The correct answer is (C), 0.04.
02
PYQ 2016
medium
physicsID: viteee-2
A metal ball of mass 2 kg moving with a velocity of 36 km/h has a head on collision with a stationary ball of mass 3 kg. If after the collision, the two balls move together, the loss in kinetic energy due to collision is
1
140 J
2
100 J
3
60 J
4
40 J
Official Solution
Correct Option: (2)
Step 1: Kinetic Energy Before Collision.
The initial kinetic energy of the moving ball is:
where and . Step 2: Kinetic Energy After Collision.
After the collision, the two balls move together with a combined mass of . Using conservation of momentum, the velocity after collision is:
The final kinetic energy is:
The loss in kinetic energy is:
Step 3: Conclusion.
The correct answer is (B), 100 J.
03
PYQ 2017
medium
physicsID: viteee-2
On a smooth plane surface (figure) two block A and B are accelerated by up by applying a force 15 N. If mass of B is twice that of A, the force on B is
1
30 N
2
15 N
3
10 N
4
5 N
Official Solution
Correct Option: (3)
Step 1: Use Newton's second law.
Let the mass of block A be , and the mass of block B be . The total force applied is 15 N, and the acceleration of the system is given by:
Step 2: Calculate the force on block B.
The force on block B is . Final Answer:
04
PYQ 2025
medium
physicsID: viteee-2
A force of acts on a body of mass . What is the acceleration of the body?
1
2
3
4
Official Solution
Correct Option: (1)
Step 1: Use Newton's Second Law of Motion
Newton's second law of motion states that:
where:
- is the force,
- is the mass,
- is the acceleration. Step 2: Rearrange the formula to solve for acceleration We are given:
- Force ,
- Mass . Rearrange the equation to solve for acceleration: Answer: Therefore, the acceleration of the body is . So, the correct answer is option (1).
05
PYQ 2025
medium
physicsID: viteee-2
A stone is dropped from a height of 45 m. What is the time taken for the stone to reach the ground?
1
3 s
2
5 s
3
6 s
4
9 s
Official Solution
Correct Option: (1)
Step 1: Use the equation of motion For a body dropped from rest, the equation for distance traveled under uniform acceleration due to gravity is: where:
- is the distance traveled (45 m),
- is the acceleration due to gravity (approximately ),
- is the time taken (what we need to find). Step 2: Substitute the given values Substitute and into the equation: Answer: Therefore, the time taken for the stone to reach the ground is approximately 3 seconds. So, the correct answer is option (1).
06
PYQ 2025
medium
physicsID: viteee-2
A body of mass 5 kg is moving with a velocity of 15 m/s. What is its momentum?
1
2
3
4
Official Solution
Correct Option: (1)
Step 1: Use the formula for momentum
Momentum is given by the formula: where:
- is the mass of the body,
- is the velocity of the body. Step 2: Substitute the given values
We are given:
- Mass ,
- Velocity . Substitute these values into the formula: Answer: Therefore, the momentum of the body is . So, the correct answer is option (1).
