50 units per sec
35 units per sec
22 units per sec
13 units per sec
Correct answer is B
s=(4t+3)(t−2)
dsdt=(4t+3)(1)+(t−2)(4)
= 4t+3+4t−8
= 8t - 5
dsdt(t=5secs)=8(5)−5
= 40 - 5
= 35 units per sec
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