All solutions here are SUGGESTED. Mr. Teng will hold no liability for any errors. Comments are entirely personal opinions.

(i)

(ii)

(a)

When

When

(b)

When

Reject since when

(c)

From the graph, As

### KS Comments:

(i) can be resolved easily with the MF15 formula.

(ii), students can actually plot the entire graph of t against v into the graphing calculator and calculate the v when t = 1. They should draw the graph out then. Should they do this, (c) will be solved conveniently.

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