1
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

For motion under central forces, which quantity will be conserved?

A
Kinetic energy
B
Mechanical energy
C
Potential energy
D
None of the above
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A particle of mass m is moving in a horizontal circle of radius R under a centripetal force equal to $$-\frac{A}{R^2}$$ (A = constant). The total energy of the particle is

A
$$\frac{A}{R}$$
B
$$-\frac{A}{R}$$
C
$$\frac{A}{2R}$$
D
$$-\frac{A}{2R}$$
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A force of 20 N is applied on a body of mass 5 kg resting on a horizontal plane. The body gains a kinetic energy of 10 J after it moves a distance 2 m. The frictional force is

A
10 N
B
15 N
C
20 N
D
30 N
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