Question

If the kinetic energy of a particle continuously increases with time,

• A. the resultant force on it must be parallel to velocity at all instants.
• B. the resultant force on it must be at an angle less than 90 degrees at all instants.
• C. the resultant force on it must be at an angle equal to 90 degrees at all instants.
• D. the resultant force on it must be at an angle greater than 90 degrees at all instants.

Answer 1

The correct option is B the resultant force on it must be at an angle less than 90 degrees at all instants.