A block of mass 5 kg moves along the x-direction subject to the force F = (–20x + 10) N, with the value of x in metre. At time t = 0 s, it is at rest at position x = 1 m. The position and momentum of the block at t = (π/4) s are
1
–0.5 m, 5 kg m/s
2
0.5 m, 0 kg m/s
3
0.5 m, –5 kg m/s
4
–1 m, 5 kg m/s