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} $



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