A ball is dropped from top of a building of height 80 ,m . At same instant another ball is thrown up

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2.Motion in Straight Line

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A ball is dropped from the top of a building of height $80 \,m$. At same instant another ball is thrown upwards with speed $50 \,m / s$ from the bottom of the building. The time at which balls will meet is ........ $s$

A

$1.6$

B

$5$

C

$8$

D

$10$

Solution

(a)

$t=\frac{h}{v_{\text {rel }}}=\frac{80}{50}$

$\Rightarrow t=1.6 \,s$

Standard 11

Physics

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