Question

the initial velocity of a body is 10 m/s. after 5 s the velocity of the body is 20 m/s. its velocity after 7 s is?

Answer 1

First, we calculate the acceleration,
\[a=\frac{\Delta v}{\Delta t}=\frac{20-10}{5-0}=2\ m/s^2\] Then, we calculate the velocity (after 7 s from the initiation of the movement),
\[v=v_0+at=10+2\cdot7=24\ m/s\]