Question

A body starts moving with an initial velocity 50 m/s and acceleration 20 $m/s^2$. How much distance it will cover in 4s ? Also, calculate its average speed during this time interval.

Answer 1

Here,

u = 50 m/s, a = 20 $m/s^2$,

t = 4s, s = ?

s = ut + $\frac{{at}^2}{2}$

= (50 × 4) + $\frac{20x4x4}{2}$

s = 200 + 160 = 360 m

Average speed = $\frac{TotalDistance}{TimeTaken}$

= $\frac{360}{4}$ m/s

Average speed = 90 m/s