Speed of a car The figure shows the time to distance graph for a car accelerating from a standstill

CH2.1 Limits and Continuity Ex15
數學系卡安很閒 所以決定拯救沒辦法用slader和chegg的莘莘學子
Speed of a car The accompanying figure shows the time-todistance graph for a sports car accelerating from a standstill.
a. Estimate the slopes of secants PQ1, PQ2, PQ3, and PQ4,
arranging them in order in a table like the one in Figure 2.6.
What are the appropriate units for these slopes?
b. Then estimate the car’s speed at time t = 20 sec

[yeahayat]

I GOT There in B 50 m/s because the last Q are equal to 50 m/s and this graph will be straight towards the end. You can check it in 64 page (Thomas Calculus 13th)

[minhvu]

How did you get Q3=50m/s, I tried to plug it in the calculator and the result is much lower than that

[hazeljo]

Can you explain b) in English? I don’t understand the car’s speed at time t=20.

[minhvu]

How did you get Q3=50m/s, I tried to plug it in the calculator and the result is much lower than that