## 1. If the sum of m terms of an A.P. is the same as the sum of n terms, then what is the sum of mn tems?

Question

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## Answers ( )

Answer:=

m

F−μmg

m

F

a

1

=

m

F

=

10

80

=8 m/s

2

a

2

=

m

F−μmg

=

10

80−0.2×10×10

=6 m/s

2

∴

a

2

a

1

=

6

8

=

3

4