Laws Of Motion Question 183
Question: An object with a mass 10 kg moves at a constant velocity of 10 m/sec. A constant force then acts for 4 second on the object and gives it a speed of 2 m/sec in opposite direction. The acceleration produced in it, is[CPMT 1971]
Options:
A)$ 3m/{{\sec }^{2}} $
B) $ -3m/{{\sec }^{2}} $
C) $ 0.3m/{{\sec }^{2}} $
D) $ -0.3m/{{\sec }^{2}} $
Show Answer
Answer:
Correct Answer: B
Solution:
$ \vec{a}=\frac{\overrightarrow{v _{2}}-\overrightarrow{v _{1}}}{t}=\frac{(-2)-(+10)}{4}=\frac{-12}{4}=-3\ m/s^{2} $
