1
JEE Main 2023 (Online) 29th January Evening Shift
+4
-1 Identify the correct statements from the following :

A. Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket is negative.

B. Work done by gravitational force in lifting a bucket out of a well by a rope tied to the bucket is negative.

C. Work done by friction on a body sliding down an inclined plane is positive.

D. Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity is zero.

E. Work done by the air resistance on an oscillating pendulum is negative.

Choose the correct answer from the options given below :

A
A and C only
B
B and D only
C
B, D and E only
D
B and E only
2
JEE Main 2023 (Online) 29th January Morning Shift
+4
-1

A stone is projected at angle $$30^{\circ}$$ to the horizontal. The ratio of kinetic energy of the stone at point of projection to its kinetic energy at the highest point of flight will be -

A
1 : 4
B
1 : 2
C
4 : 3
D
4 : 1
3
JEE Main 2022 (Online) 29th July Morning Shift
+4
-1 A ball is projected with kinetic energy E, at an angle of $$60^{\circ}$$ to the horizontal. The kinetic energy of this ball at the highest point of its flight will become :

A
Zero
B
$$\frac{E}{2}$$
C
$$\frac{E}{4}$$
D
E
4
JEE Main 2022 (Online) 28th July Evening Shift
+4
-1 A bullet of mass $$200 \mathrm{~g}$$ having initial kinetic energy $$90 \mathrm{~J}$$ is shot inside a long swimming pool as shown in the figure. If it's kinetic energy reduces to $$40 \mathrm{~J}$$ within $$1 \mathrm{~s}$$, the minimum length of the pool, the bullet has to travel so that it completely comes to rest is A
45 m
B
90 m
C
125 m
D
25 m
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