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36
A box of mass m = 6kg slides with speed v = 4m/s across a frictionless floor, it suddenly explodes into two pieces. One piece, with mass m1 = 2kg moves in the same direction with speed v1 = 8m/s where the velocity of the second piece is:
Correct Answer:D
Explanation:
Using conservation of momentum: 6*4 = 2*8 + 4*v2 → v2 = 2 m/s.
37
A helicopter of weight ‘W’ is ascending with zero acceleration. The upward force ‘F’ on it is:
Correct Answer:D
Explanation:
At zero acceleration, net force is zero, so F = W.
38
When a body moves with uniform velocity than it’s:
Correct Answer:C
Explanation:
For uniform motion, instantaneous and average velocities are equal.
39
The rate of change of linear momentum of a body is equal to:
Correct Answer:A
Explanation:
Newton's second law: F = dp/dt.
40
An elastic collision is the one in which:
Correct Answer:A
Explanation:
Elastic collisions conserve both kinetic energy and momentum.
41
The time rate of change of velocity is called:
Correct Answer:B
Explanation:
Acceleration is defined as the rate of change of velocity.
42
Which of the following is NOT TRUE?
Correct Answer:D
Explanation:
All statements are true for Newton's third law.