Question

a train accelerates from 20 km per hour to 80 km per hour in 4 minutes find the distance covered by it

Answer 1

a=(v-u)/t
a=(80-20)/4
a=60/4
a=15
$s = ut + 1 \div 2at {}^{2}$
s=20×4+1/2×15×4×4
=80+0.5×240
=80+120
=200km