Answer:
hope this helps
Explanation:
organisms having a body derived from three embryonic cell layers (ectoderm, mesoderm, and endoderm), as in all multicellular animals except sponges and coelenterates.
Electromagnetic waves<span> are made of oscillating magnetic and electric fields, and like all </span>waves<span>, they carry energy</span>
Yes, the objects velocity can change direction
Answer:
F = 518.4 KN
Explanation:
From work energy theorem;
Energy = workdone
In this case, Energy is kinetic energy and has a formula ½mv²
Thus;
Fd = ½mv²
We are given;
Mass of car; m = 1600 kg
Speed of car after crash; v = 18 m/s
Distance from dummy to steering wheel; d = 0.5 m
Thus;
½ × 1600 × 18² = F × 0.5
This gives;
800 × 324 = 0.5F
F = 800 × 324/0.5
F = 518400 N
F = 518.4 KN
Displacement is the area under the velocity/time graph. So for example this object's displacement in the first 3 seconds is (1/2)(3sec)(12.5 m/s)= 18.75m. (and then it starts backing up, displacement decreasing, after 3sec when velocity is negative).
But This object is never speeding up. Its velocity is smoothly decreasing at (25/6) m/s^2 (the slope of the graph). So the answer to the question is actually zero.