The kinetic energy of a particle continuously increases with time.
a) The resultant force on the particle must be parallel to the velocity at all instants.
b) The resultant force on the particle must be at an angle less than 90⁰ all the time
c) Its height above the ground level must continuously decrease
d) The magnitude of its linear momentum is increasing continuously.

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a, b are correct

b, c are correct

a, d are correct

b, d are correct

answer is D.

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Detailed Solution

The particle's kinetic energy is rising, which indicates that its velocity is continuously rising.
Therefore, for acceleration to include some components in this directions, it must be in the direction of motion or at an acute angle.
The linear momentum must rise as the speed does. P=mv.

Hence the correct answer is b,d are correct.

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