Question

an object moving at 13m/s slows uniformly at rate of 2m/s each second for a time of 6sec find average speed

Answer 1

as we all know that ...average speed is equal to...initial velocity + fibal velocity divided by total time taken...


so here...
13m/s + 2 m/s /2

15m/s /2
that is...
7.5m/s

Answer 2

Velocity after 6 seconds
v = u + at
= 13 m/s + (2 m/s² × 6 s)
= 25 m/s

Average speed = (v + u) / 2
= (25 m/s + 13 m/s) / 2
= 19 m/s

Average speed of object is 19 m/s