Question

20. A particle of mass 6.5 gm moving along
x-axis is located at x1 = 15m at ti = 5 sec
and x2 = 33m at t2 = 13 sec. Its average
velocity is:
(a) 2.4ms-1
(b) 6ms -1
(c) 4.45ms-1
(d) 2.25ms
​

Answer 1

Answer:

2.25 m/s

Explanation:

Velocity is independent of the mass(v >>> c), it just depends on the initial and final position(vector).

Initially, at t = 5, x = 15 (x-axis)

Finally, at t = 13, x = 33 (x-axis)

Displacement = final - initial position

Displacement = 33 - 15 = 18m (x-axis)

Time taken = 13 - 5 = 8sec

Therefore, velocity is :

= displacement/time

= 18/8

= 2.25 (along x-axis)

Average velocity is 2.25 m/s.