1. The problem statement, all variables and given/known data A ball is dropped from the top of a cliff. If time taken for half of the descent is 3s, then what is the time taken for the rest of rest of the descent? Take g=10m/s2 2. Relevant equations T=√(2h/g) v=u-gt s=ut-gt2/2 3. The attempt at a solution T=√(2h/g) h=T2g/2=45m ∴height of cliff=90m v=u-gt=0-(10*3)=-30ms-1 s=ut-gt2/2 45=-30t-5t2 t=-3 Looks wrong to me. Time can't be negative, can it? Also, shouldn't the answer be less than 3?