Question

a distance covered is 21 R 3. For a particle moving along a straight line, choose the correct statement(s). (MAQ () a) Magnitude of the displacement may be equal to the distance covered. b) Magnitude of the displacement is always equal to the distance covered. c) Magnitude of the displacement will never be equal to the distance. d) Magnitude of the displacement is zero where as the distance may or may not be zero. Ahad​

Answer 1

No,because if the moving object comes back to its initial position the distance travelled is not zero.

Though the moving object comes back to its initial position the distance travelled is not zero.

Displacement is calculated on the basis of initial and final position. If initial and final position are same, displacement is zero. But distance is the total distance covered from initial to final position. So, it cannot be zero in this case.

idk that it is correct answer

Answer 2

Answer:

Comparing with second equation of motion: 

s=ut+21at2

It can be concluded that: 

u=16 m/s,a=4 m/s2

Now, using first equation of motion:

v=u+at

v=16−4t

For v=0 we get, t=4s

Here, direction of velocity will reverse. So total distance travelled will be the sum of displacement in first four seconds and displacement in next four seconds.

 

Now,

Displacement at

t=0,x=0

t=4,x=32

t=8,x=0

∴ Distance = (distance from x=0 to x=32) + (distance from x=32 to x=0) 

∴ Distance =32+32=64 m