Q 11-02-124JEE MainJEE Main 2019 (8 Apr, Shift 2)Easy
A particle starts from origin O from rest and moves with a uniform acceleration along the positive $x$-axis. Identify all figures that correctly represent the motion qualitatively. ($a$ = acceleration, $v$ = velocity, $x$ = displacement, $t$ = time)
Answer: (A) (A), (B), (D)
- (A): acceleration is constant, so the $a$-$t$ graph is a horizontal line. Correct.
- (B): from rest, $v = at$ is a straight line through the origin. Correct.
- (C): this $x$-$t$ curve bends over and flattens, which means the velocity decreases to zero. Wrong.
- (D): $x = \frac12at^2$ is a parabola curving upwards from the origin. Correct.
So (A), (B) and (D).
Solution by Sreeraj P, M.Sc Physics