Question

A particle is acted upon by a constant force always normal to the direction of motion of the particle. It is therefore inferred that-
(i) Its velocity is constant
(ii) It moves in a straight line
(iii) Its speed is constant
(iv) Its acceleration is constant

• A. i, iv
• B. iii, iv
• C. i, ii
• D. i, ii, iii

Answer 1

The correct option is A i, iv

A particle is acted upon by a constant force away normal to the direction of motion of the particle.

It is therefore, inferred that,

(i) $v$=constant, $F$= constant

(ii) It moves in a straight line

(iii) Its speed is constant

(iv) Its acceleration= constant

If $F$=constant

$F=ma$

$a$ will be constant hence (iv) is correct.

And if $a$ will be constant, $n$ will be constant.