Question

A train moving at 30km/h accelerates to a speed of 50km/h in 30seconds. Find the avreage acceleration and distance travelled in metres during the period of acceleration

Answer 1

u = 30 km/h

30×1000/3600

8.33m/s

v= 50km/h

50×1000/3600

13.88

time 30 s

a=v-u/t

13.88 -8.33/30

13.60m/s

distance

2as= v²-u²

2×13.60×s= 13.88²-8.33²

27.2s=192.6544-69.3889

27.2s = 123.2655

s= 123.2655/27.2

s= 4.531m