Answer:
The instantaneous speed of the object after the first five seconds is 12.5 m/s.
(C) is correct option.
Explanation:
Given that,
An object starts at rest. Its acceleration over 30 seconds.
We need to calculate the instantaneous speed of the object after the first five seconds
We know that,
Area under the acceleration -time graph gives speed.
According to figure,
[tex]speed = area\ of\ tringle[/tex]
[tex]speed=\dfrac{1}{2}\times b\times h[/tex]
[tex]speed =\dfrac{1}{2}\times5\times5[/tex]
[tex]speed-12.5\ m/s[/tex]
Hence, The instantaneous speed of the object after the first five seconds is 12.5 m/s.
