Physicshard · Past Paper
A body is projected vertically upwards with a velocity u. It passes a point at height h at times t1 and t2. The sum t1+t2 is:
Au/g
B2u/g
Cu/2g
Dh/g
✓ Correct Answer: B — 2u/g
t1 and t2 are roots of 0.5gt^2 - ut + h = 0. Sum of roots = -(-u) / (0.5g) = 2u/g.
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