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A person starts from a point and travels...

A person starts from a point and travels along a path PQRP as shown in the figure. Then, the 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 Pythagorous theorem
`PR^(2)=PQ^(2)+RQ^(2)`
`PR^(2)=4^(2)+3^(2)`
`PR^(2)=16+9`
`PR= sqrt(25) rArr PR=5 m`
Average speed `=("total distance")/("total time")=(4m +3m+5m)/(20s+10s+30s)`
`=(12m)/(60s) =0.2 ms^(-1)`
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