Answer to Question #104855 in Calculus for Kassim

Question #104855
At a time t seconds after it is thrown up in the air, a tomato is
at a height (in meters) of f(t) = =4.9t
2 +50t +5 m.
A. What is the average velocity of the tomato during the
first 4 seconds? (Include units.)
B. Find (exactly) the instantaneous velocity of the tomato
at t = 4. (Include units.)
C. What is the acceleration at t = 4? (Include units.)
D. How high does the tomato go? (Include units.)
E. How long is the tomato in the air?
1
Expert's answer
2020-03-13T10:16:09-0400

A. Vˉ=f(4)f(0)4=30.4mc\bar{V}= \frac{f(4)-f(0)}{4}=30.4 \frac{m}{c}

B. V(t)=ft=9.8t+50V(t)=f_t'=-9.8t+50 hence V(4)=10.8msV(4)=10.8\frac{m}{s}

C. a(t)=Vt=9.8ms2a(t)=V_t'=-9.8\frac{m}{s^2}

D. Ifτ\tau is time up then V(τ)=0V(\tau)=0 hence 9.8τ+50=0-9.8\tau+50=0 then τ=5.1s\tau=5.1s then f(τ)=H132.6mf(\tau)=H\approx132.6m

E. If tt is time down then H=gt22H=\frac{gt^2}{2} hence t=2Hg5.1st=\sqrt \frac{2H}{g}\approx5.1s then T=t+τ10.2sT=t+\tau\approx10.2s


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