Question

The velocity of an object increases at a constant rate from 20m/s to 50m/s in 10s. Find the acceleration

Answer 1

Given Initial velocity u = $\rm 20m{s}^{-1}$

Final velocity v = $\rm 50m{s}^{-1}$

Time t = 10s

$\rm \: Acceleration \: a = \frac{v - u}{t}$

$\rm \: a= \frac{50m {s}^{ - 1} - 20m {s}^{ - 1} }{10s}$

$\rm \: a= \frac{30m {s}^{ - 1} }{10s}$

$\rm \fbox{ \therefore \: acceleration = 3m {s}^{ - 2} }$

Answer 2

initial velocity,u-20m/s^2

Final velocity,v- 50m/s^2

Time,t- 10s

Using the formula,

Acceleration,a= v-u/t

a=50-20/10= 30m/s^2