2.Motion in Straight Line
medium

$200\, m$ ઊંચાઇના ટાવર પરથી પદાથૅને $20\, m/sec$ વેગથી ઉપર તરફ ફેંકતા જમીન પર કેટલા ........$m/sec$ વેગથી પહોંચે?

A

$60$

B

$65$

C

$70$

D

$75$

Solution

(b) Speed of stone in a vertically upward direction is $20\;m/s$. So for vertical downward motion we will consider $u = – 20\;m/s$

${v^2} = {u^2} + 2gh = {( – 20)^2} + 2 \times 9.8 \times 200 = 4320\;m/s$

$v\simeq   65\,m/s$.

Standard 11
Physics

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