V = 8 -9t if t<1
V = 8 - 2t if t > 2
Find the value of V (m/s) when t = 3.
10 m/s
2 m/s
3 m/s
4 m/s
V = 8 -9t if t<1 ...(i)
v= 8 - 2t if t > 2 ... (ii)
Given t = 3
since t > 2, we consider equation (ii)
V = 8 - 2t
= 8 - 2(3)
= 8 - 6
= 2
Therefore, V = 2 m/s
In a series if (i) Tn = 2n − 1 find S5 (ii) Tn = (−1)n then find (a) S1 (b) S2 (c) S3 (d) S4
Hence prove that S1 = S3 and S2 = S4