If a body starting from the rest travels with a uniform acceleration of \( 10 \mathrm{~ms}^{-2} ....

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If a body starting from the rest travels with a
\( \mathrm{P} \)
uniform acceleration of \( 10 \mathrm{~ms}^{-2} \) for first 10 second and with uniform acceleration \( 5 \mathrm{~ms}^{-2} \) for next 20 seconds, then average acceleration of the body for \( 30 \mathrm{~s} \) is:
(1) \( 15 \mathrm{~ms}^{-2} \)
(2) \( 10 \mathrm{~ms}^{-2} \)
(3) \( 20 \mathrm{~ms}^{-2} \)
(4) \( 20 / 3 \mathrm{~ms}^{-2} \)


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