Practice free →
HomeCBSE Class 9physicsmotion › A car starts from rest and reaches 30 m/s in 6 s…

A car starts from rest and reaches 30 m/s in 6 seconds. The distance covered in this time is:

A30 m
B60 m
C180 m
D90 m
Answer & Solution
Correct answer: D. 90 m
u = 0, v = 30 m/s, t = 6 s. Acceleration a = (v − u)/t = 30/6 = 5 m/s². Distance s = ut + ½at² = 0 + ½ × 5 × 36 = 90 m. (Alternative: average velocity = (0 + 30)/2 = 15 m/s, distance = avg × t = 15 × 6 = 90 m.)
Solve this in the app — CBSE Class 9 practice & 24k+ MCQs →
Related questions