Question

A bus increases its speed 20km/h to 50km/h in 10s .cpaculate acceleration

Answer 1

v = 50 m/s = 50*(5/18)=13.89 m/s u=20m/s=20*(5/18)=5.56 m/s Assuming that the acceleration is constant,
acceleration=∆v/∆t
=v-u/t
=13.89-5.56/10
=8.33/10
Acceleration =0.833m/s²

Answer 2

u = 20km/hr
v=50km/hr
t= 10s

acceleration = v- u÷t
20 km/hr - 50km/hr ÷ 10s
- 30km/hr ÷ 10s
- 3km/hr
we know that SI unit of acceleration is m/s2
so,
-3km/hr × 5 ÷ 18 = -5/6 m/s2 is the ans