Question

If a 4.5 kg object is dropped from a height of 6.0 m, what will be its velocity when it is halfway toward the ground? (Use g = 9.80 m/s2, and ignore air resistance.)

7.7 m/s
11 m/s
16 m/s
29 m/s

Answer 1

Use v^2 = v0^2 + 2gh with h = 3.0 m (half of 6.0 m) and v0 = 0:

v = sqrt(2·9.80·3.0) = sqrt(58.8) ≈ 7.7 m/s.

Answer: 7.7 m/s.