7 the question answer please

7 the question answer please 10 Ctn in the tarn Calculo eau«d by tar"' A With a vekrity X) m to rest by applying brakes in A ravels a of km a km h o fr«n B to : (i) average (if) a•e•«•. gain. Ans. (i) 6837 km A moving with a vel«ity EA.

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Q 7 s p e e d = 60 K m / h r I n c o m i n g b a c k = 80 K m / h r A v e r a g e s p e e d = T o t a l d i s \tan c e / t o t a l t i m e = \frac{2 x}{\frac{x}{60} + \frac{x}{80}} = 68.5 k m / h r A v e r a g e v e l o c i t y = T o t a l d i s p l a c e m e n t / T o t a l t i m e = 0 R E G A R D S