Question

a body accelerates uniformly from 30 metre per second to 80 metre per second in 5 second what is its average speed​

Answer 1

Average speed = Total Dist/Total time

a= (v-u)/t = (80-30)/5= 50/5 = 10m/s²

v²-u² = 2as

6400-900 = 2×10×s

s = 5500/20 = 275m

Therefore,

Average speed = 275/5 = 55m/s

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