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A stone is projected from level ground a...

A stone is projected from level ground at `t=0` sec such that its horizontal and vertical components of initial velocity are `10(m)/(s)` and `20(m)/(s)` respectively. Then the instant of time at which tangential and normal components of acceleration of stone are same is: (neglect air resistance)`g=10(m)/(s^2)`.

A

`4%`

B

`3%`

C

`2%`

D

`1%`

Text Solution

Verified by Experts

The correct Answer is:
D
Area `A=lxxb`
`l=25.2 cm and Deltal=0.1cm" "b=16.8 cm and Deltab=0.1 cm`
`therefore" Relative error in area "((DeltaA)/(A))=((Deltal)/(l))+((Deltab)/(b))=((0.1)/(25.2))+((0.1)/(16.8))=0.004+0.006=0.01`
`((DeltaA)/(A))100=0.01xx100`
`"Percentage = 1%"`
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