Fig. 2 (b) .16 shows the time-acceleration graph for a particle in rectillinear motion. Find the average acceleration in first twenty seconds.
.

Options

A. `45 m//s^(2)`
B. `40 m//s^(2)`
C. `30 m//s^(2)`
D. `20 m//s^(2)`

Answer

C

Explanation

Average accleration (a) = )change in veloity)/(time taken)`
:. Chang in velocity = average acc. Xx time taken ltbRgt = area of acc -time graph
Average acceleration = (area OABE)/(20 s)= (600)/(20)`
`=30 m//s^2`.