0 and 1
0 and 4
0 and 5
1 and 4
Correct answer is D
s=ut+at22
This movement is against gravity, so it is negative.
s=ut−gt22
s=20m,u=25ms−1
20=25t−10t22⟹20=25t−5t2
5t2−25t+20=0
5t2−5t−20t+20=0⟹5t(t−1)−20(t−1)=0
5t−20=0 or t - 1 = 0
t=1 or 4
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