Question 7
Newton's Laws and MomentumA body of mass 4 kg resting on a smooth horizontal plane is simultaneously acted upon by two perpendicular forces 6 N and 8 N. Calculate the acceleration of the motion.
- A.2.5 ms−1.
- B.3.0 ms−1.
- C.4.0 ms−1.
- D.4.5 ms−1.
Show the answer and explanation
Answer: A (2.5 ms−1.)
Explanation
The resultant of perpendicular forces is √(62 + 82) = 10 N. a = F/m = 10 ÷ 4 = 2.5 m s−2.