x=5cos(2πt+π)
t=1.5sec
Displacement, x=5cos(2π×1.5+π)=5cos(4π)
x=5m. . . . . .(1)
Velocity, v=dxdt
v=−10πsin(2πt+π)
v=−10πsin(2π×1.5+π)
v=−10πsin(4π)
v=0m/s. . . . .(2)
Acceleration, a=dvdt
a=−20π2cos(2πt+π)
a=−20π2cos(2π×1.5+π)
a=−20π2cos(4π)
a=−20π2
The correct option is B.