Question

A body of mass 4 kg lying on a rough plane inclined at
30° to the horizontal has an acceleration of 2 m s-2 when
pulled directly up the plane by a force of 6 kg wt. Calculate
its acceleration when a force of 3 kg wt is applied down
the plane. Given:g = 10 ms-2. [Ans. 4.5 m s-2)​

Answer 1

Answer:

4.5

Explanation:

f+ mg\2-f =ma2

3g+2g-4g+8=4a2

9+8/4 = a2

a2=18\4

a2=4.5