KCET 2025 Physics Paper

To determine the mass of the block, consider the following analysis using the given data:
Friction: Since the block is moving, we deal with kinetic friction in this scenario.
Acceleration Calculation:
a=‌

v−u

t

=‌

20−0

3

=‌

20

3

m∕ s2
Here, v is the final velocity, u is the initial velocity, and t is the time.
Acceleration Calculation:
a=‌

v−u

t

=‌

20−0

3

=‌

20

3

m∕ s2
Here, v is the final velocity, u is the initial velocity, and t is the time.
Net Force Calculation:
The net force acting on the block can be expressed as:
F−fk=m×a
where F=20N is the applied force and fk is the force due to kinetic friction.
Kinetic Friction Force:
fk= coefficient of kinetic friction × normal force =0.25×m×g
Using the Net Force Equation:
Substitute the values into the equation:
20−0.25×m×10=m×‌

20

3

Solving for m :
20−2.5m=‌

20

3

m
Rearranging the terms gives:
20=‌

20

3

m+2.5m
Combine the terms:
‌20=(‌

20+7.5

3

)m
‌20=‌

27.5

3

m
Simplifying the equation:
m=‌

20×3

27.5

Therefore,
m≈2.2‌kg
Thus, the mass of the block is approximately 2.2 kg .