Laws Of Motion Question 290
Question: The force required to stop a car of mass 800 kg, moving at a speed of $ 20m{{s}^{-1}} $ over a distance of 25m in 2.5 sec is
Options:
A) 1200N
B) 6400 N
C) 1600N
D) 1800N
Show Answer
Answer:
Correct Answer: B
Solution:
[b] As we know, $ |a|=| \frac{v^{2}-u^{2}}{2S} |=\frac{400}{50}=8\text{ m/}{{s}^{2}}. $ So force required $ =F=ma $
$ =800\times 8=6400N $
