The velocity (u)-time (t) graph of an object moving along a straight line is as shown is Fig. 2 (b) . 30. Calculate the distance covered by object between ` (i) t =0 to t=5 s` (ii) ` t=0 to t=10 s`.
.

Explanation

Velocity at t = 0 is u = 0
Velocity at t = 2 s is v = 20 m/s
So, from v = u + at we get, ` a = 10 m// s^(2)`
So distance covered between 0 to 2 s
From 2 s to 5 s, velocity is same i.e., 20 m/s
so distance travelled ` = 20 xx 3 = 60 m`
`:.` Total distance covered between 0 to 5 s
` = 20 + 60 = 80 m `