How much force is needed to cause a car weighing 800kg to accelerate at a rate of 5 m/s^2? Suppose after accelerating the car begins to travel at a constant velocity of 10 m/s. How much momentum has the car generated at the constant velocity? Use a few short sentences to describe how you arrived at your answer.

50 seconds

t = d /v

where t is the time taken, d is the distance and v is the speed

d= 70 m and s= 1.4 m/s

Therefore;

t = 70/1.4

 = 50 seconds

40 meters

dc = Vc × t

Where dc is the distance down stream, Vc is the velocity downstream and t is the time taken

Vc = 0.8 m/s

t = 50 seconds

Therefore;

dc = 0.8 × 50

    = 40 meters

55 degrees

cosA = 0.8/1.4  

A = 55.15 ° with the horizontal (shore) upstream  

Therefore; the angle to aim from the shore is 55°