Question

10.A bus moves with 36 km/h for 2 hours and
54 km/h for 1 hour, then its average speed is
(a) 11.66 m/s
(b) 25 m/s
(c) 20 m/s
(d) 30 m/s​

Answer 1

Answer:-

s2=6252×11.33=27.5m

Explanation:-

u=42×518=11.66m/s

and v=0 So, s1=6m

when, u=90×518=25m/s

and v=0 .

Then, s2=?

For first case ⇒

v2=u2+2as1

0=(11.66)2+2a×6

(s1=6m)

a=−11.66×11.6612

a=−11.33m/s2

For second case v2=u2+2as2

0=(25)2+2(−11.33)×s2

s2=6252×11.33=27.5m

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Answer 2

a bus moves with 36 km per hour for two hours and 54 km per hour for 1 hour then its average speed is 11.66 minute per second