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Q: A car falls from an inclined section, and falls to the ground in 0.9 seconds. (Suppose g = 10m/s²) What is its speed while hitting the ground?
  • A. 9 ms⁻ ²
  • B. 9 ms⁻¹
  • C. 9.5 ms⁻¹
  • D. 5 ms⁻¹
Correct Answer: Option B - Given– u = 0, t = 0.9 sec From the first equation of motion - v = u + gt v = 0 + 10 x 0.9 sec v = 9 ms⁻¹
B. Given– u = 0, t = 0.9 sec From the first equation of motion - v = u + gt v = 0 + 10 x 0.9 sec v = 9 ms⁻¹

Explanations:

Given– u = 0, t = 0.9 sec From the first equation of motion - v = u + gt v = 0 + 10 x 0.9 sec v = 9 ms⁻¹