Question

A scooter increases its speed from 36 km/h to 72 km/h in 10 s. What is its acceleration?

• A. $7.2m/s^2$
• B. $1m/s^2$
• C. $3.6m/s^2$
• D. $10m/s^2$

Answer 1

The correct option is B $1m/s^2$

in the given question we have
u=36 km/hr =$36\times \frac{5}{18}m/s=10m/s$
v= 72 km/hr=$72\times \frac{5}{18}m/s=20m/s$
t=10 s
a=?
we know the formula
v= u +at
20 = 10+ a 10
20-10 =10 a
10 = 10 a
a = 1 $m/s^2$