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Q: A car falls from an outcrop and lands in 0.4 seconds. What is its speed while hitting the ground? (Suppose g = 10m/s²)
  • A. 4 ms¹
  • B. 4 ms⁻²
  • C. 5 ms⁻¹
  • D. 4 ms⁻¹
Correct Answer: Option D - Given - u = 0 v = ? t = 0.4 sec g = 10 m/sec² From, first equation of motion, v = u + gt v = 0 + 10 × 0.4 v = 4 m/sec.
D. Given - u = 0 v = ? t = 0.4 sec g = 10 m/sec² From, first equation of motion, v = u + gt v = 0 + 10 × 0.4 v = 4 m/sec.

Explanations:

Given - u = 0 v = ? t = 0.4 sec g = 10 m/sec² From, first equation of motion, v = u + gt v = 0 + 10 × 0.4 v = 4 m/sec.