An arrow is projected straight upwards at a speed of 100m/s. With what speed will it return to the ground if air resistance is ignored?


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Question Number 29464 by NECx last updated on 09/Feb/18

$A n a r r o w i s p r o j e c t e d s t r a i g h t$ $u p w a r d s a t a s p e e d o f 100 m / s .$ $W i t h w h a t s p e e d w i l l i t r e t u r n t o$ $t h e g r o u n d i f a i r r e s i s t a n c e i s$ $i g n o r e d ?$
	Answered by mrW2 last updated on 09/Feb/18

	$t h e a r r o w h a s t h e s a m e k i n e t i c e n e r g y$ $w h e n i t r e t u r n s t o t h e s t a r t i n g p o i n t,$ $i . e . i t h a s t h e s a m e s p e e d a s i t l e f t$ $t h a t p o i n t .$ $\Rightarrow v = 100 m / s$
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