A wheel starting from rest is uniformly accelerate at 4 `rad /s^2` for 10 seconds. It is allowed to rotate uniformly for the next 10 seconds and is finally brought to rest in the next 10 seconds. Find the total angle rotated by the wheel.

Answer

D

Explanation

Area under the curve wil decide the totla angle rotated.
`:. Maximum angular velocity
` =4xx10=40 rad/s

Therefore ,Area under the curve
`=1/2xx10xx40+40xx10+1/2xx40xx10`
`=800rad`
`:. Total angle rotated =800 rad.