Question

A body moves with uniform speed along a straight line. So, it is acted upon by:

• A. Unbalanced force
• B. Balanced force
• C. No net external force
• D. None of these

Answer 1

Answer: (B), (C)

The correct options are
B Balanced force
C No net external force

Under the action of a balanced force or in absence of any net external force, a body moves with uniform speed along a straight line.

According to Newton's second law of motion.

$F=ma$

$F$ : Net external forces

$m$ : mass of the object

$a$ : acceleration produced by forces

In this case, the net force is zero so acceleration will be zero.