EXPLAIN WITH STEPS PLZ! * A boat moves towards the east with velocity of 20 m/s, then it is affected by acceleration towards the west of 4 m/s^2?, so its displacement after 15 s from the moment at which the boat starts to acquire the acceleration equals

a 350 m towards the east

b 300 m towards the west

c) 750 m towards the east

d) 150 m towards the west

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

Asteam power plant operates on an ideal reheat rankine cycle between the pressure limits of 15 mpa and 10 kpa. the mass flow rate of steam through the cycle is 12 kg/s. steam enters both stages of the turbine at 500°c. if the moisture content of the steam at the exit of the low-pressure turbine is not to exceed 10 percent, determine (a) the pressure at which reheating takes place, (b) the total rate of heat input in the boiler, and (c) the thermal efficiency of the cycle. also, show the cycle on a t-s diagram with respect to the saturation lines. (2.15 mpa; 45.0 mw; 42.6%)