Which of the following is NOT a correct statement?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. The speed of 99 km/h is less than the speed of 24 m/s.
Calculations:
I. The speed of 20 m/s is less than the speed of 85 km/h.
20 m/s in km/h = 20 × (18/5) = 72 km/h
Hence, first statement is true
II. We know that, Speed = Distance/time
Hence, time = Distance/speed
Second statement is also true.
III. We know that, if distance is constant then speed is inversely proportional to time.
Hence, less time means more speed.
Third statement is also true.
IV. 99 km/h in m/s = 99 × 5/18 = 27.5 m/s
we can see that 27.5 m/s is greater than 24 m/s
Hence, fourth statement is false.