Question

If net unbalanced external force acting on an object is zero, then

(A) Velocity of object may or may not be zero

(B) Acceleration of object must be zero

(C) Velocity of object must be non-zero

(D) Acceleration of object must be non-zero constant

Choose the correct option​

Answer 1

The correct option would be B) Acceleration of object must be zero

Explanation:

• When all the forces acting on an object become zero, then object maintains a constant velocity

• If the velocity is zero it remains at rest otherwise it moves with same constant velocity

• We also know that acceleration is equal to the change in velocity with respect to time

• If velocity does not change. Then Vf-Vi = 0

• Acceleration = (Vf-Vi)/t = 0/t = o

• Thus, acceleration would be equal to zero

Answer 2

Answer:

hhhhh

Explanation:

Find the accelerations a,,a,, ag of the three blocks

shown in figure (6-E8) if a horizontal force of 10 N is

applied on (a) 2 kg block, (b) 3 kg block, (c) 7 kg block.

Take g = 10 m/s

?

2 kg

My = 0.2

H2=0.3

H3= 0.0

a1

a2

3 kg

7 kg

a3