Question

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 90° all the time.
(c) Its height above the ground level must continuously decrease.
(d) The magnitude of its linear momentum is increasing continuously.

Answer 1

(b) The resultant force on the particle must be at an angle less than 90° all the time.
(d) The magnitude of its linear momentum is increasing continuously.