Question

Calculate acceleration of a body if (3 marks)

a. Its velocity changes from 10ms-1 to 20ms-1 in 4s​

Answer 1

• initial velocity=u=10m/s
• Final velocity=v=20m/s
• Time=t=4s

We know

$\boxed{\sf Acceleration=\dfrac{v-u}{t}}$

$\\ \sf\longmapsto Acceleration=\dfrac{20-10}{4}$

$\\ \sf\longmapsto Acceleration=\dfrac{10}{4}$

$\\ \sf\longmapsto Acceleration=2.5m/s^2$

Answer 2

Answer:

• u= 10m/s
• v=20m/s
• t=4 sec
• a= change in speed with time
• a = v-u÷t
• a= 20 -10÷4
• a = 5 m/ s×s