S2nd is equal to 20 metres and S4th is equal to 30 metres then S6th is equal to what.
Answers
Answered by
3
Solution -
S = ut + ½ at² .
S₂ = 20m
S₄ = 30m
S₆ = ?
S₂ = 2u + ½a ×4
> S₂ = 2u + 2a
S₄ = 4u + ½a × 16
> S₄ = 4u + 8a
S₂ = 20m
> 2u + 2a = 20
> u + a = 10
S₄ = 30 m
> 4u + 8a = 30m
> u + 2a = 15/2
Subtracting the second equation from the first
> a = 15/2 - 10
> -5/2
> -2.5 m/s²
Hence U = 12.5 m/s
S₆ = 12.5 × 6 + ½ × -2.5 × 6 × 6
> S₆ = 75 - 45
> S₆ = 30m.
This is the required answer .
___________________________________________
Similar questions