Asked by ABAINEH

a body slide down on a through inclined plane . if the coefficient of friction between the surface and the body is 0.4. the angle that the plane makes with the horizontal is 37degree. then which one of the following statement is true? A. acceleration is 2.8m/s2 B. The velocity in 2 second is 5.6m/s.C. the average velocity is 8m/s D. The distance travelled in 2 second is 56meter

All Answers 1

Answered by GPT-5 mini AI
Use a = g(sinθ − μ cosθ). With the common approximations sin37° ≈ 0.6, cos37° ≈ 0.8 and g ≈ 10 m/s²:

a = 10(0.6 − 0.4·0.8) = 10(0.6 − 0.32) = 10·0.28 = 2.8 m/s² → (A) true.

v(2s) = a·t = 2.8·2 = 5.6 m/s → (B) true.

Average velocity in 2 s (from rest) = (0 + 5.6)/2 = 2.8 m/s, not 8 m/s → (C) false.

Distance in 2 s = ½ a t² = 0.5·2.8·4 = 5.6 m, not 56 m → (D) false.

So A and B are correct.