2) two vehicles approach a right angle intersection and then collide. after the collision, they become entangled. if their mass ratios were 1: 4 and their respective speeds as they approached were both 13 m/s, find the magnitude and direction of the final velocity of the wreck.

Explanation:

Given

Given two vehicles approach a right angle

Suppose one is traveling with towards north and other towards east

Ratio of their masses is

Both have a common velocity(u) of 13 m/s and v be the final velocity at an angle of w.r.t to east  after collision

after collision they both entangled thus

conserving Momentum in east i.e horizontal direction

---1

conserving momentum in North direction i.e. in vertical direction

---2

Divide 1 &2  we get

w.r.t east

Thus v is given by

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

this could be newton#'s law of cooling. the cooling curve is exponential