The velocity of a particle traveling in a straight line is given by v= (6t-3t^2)m/s, where t is in seconds. if s =0 when t= 0, determine the particle's deceleration and position when t =3s how far has the particle travelled during the 3-s time interval, and what is its average speed?

Water vapor initially at 10 bar and 400 °c is contained within a piston-cylinder assembly. the water lost heat to the surrounding according to isochoric (iso-volumetric) process until its temperature is 150 °c. the water is then condensed isothermally to saturated liquid. for the water as a system, calculate the work in kj/kg