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A person starts from a point P and trave...

A person starts from a point P and travels along a path PQRS as shown in the figure, then speed of the person is _____ `ms^(-1)`

A

0.2

B

20

C

12

D

0.4

Text Solution

Verified by Experts

The correct Answer is:
A

From the given figure , by pythagoras theorem
`PR^(2) = PQ^(2) +RQ^(2)`
` PR^(2) = 4^(2) +3^(2)`
` PR^(2) = 16 + 9`
`PR = sqrt25 Rightarrow PR = 5 cm`
Average speed = `("total distance")/("total time")`
` (4 m + 3m + 5m )/( 20s + 10 s + 30 s) = (12m)/(60s ) = 0.2 m s ^(-2)`
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