Question

A body of mass $10\, kg$ is moving with a constant velocity of $10 \,m/s.$ When a constant force acts for $4\, s$ on it, it moves with a velocity $2 \,m/s$ in the opposite direction. The acceleration produced in it is

• A. $3 \,m / s ^{2}$
• B. $-3\, m / s ^{2}$
• C. $0.3 \,m / s ^{2}$
• D. $0.03 \,m / s ^{2}$

Answer 1

Answer: (B)

According to equation of motion
$v=u+a t$
$\Rightarrow -2=10+a \times 4$
$\therefore a=-3 \,m/s ^{2}$