Question

A car has speeds of 18 km/hr and 54km/hr at the beginning and end of a measured half kilometres distance. If the car possesses uniform acceleration, how much further must it travel before it attains a speed of 90km/hr

Answer 1

ans-1km

Explanation:

v×v-u×u=2as

here,

54×54-18×18=2×a×0.5

so a=72×36

when v=90,

90×90-54×54=2×36×72×S

so S=1km