Explain tissue which moves particles or mucus in specific direction. 

The position of a particle moving along x-axis varies eith time t as x=4t-t^(2)+1 . Find the time interval(s) during which the particle is moving along positive x-direction.

A particle is moving in a circle:

A particle is projected from a point P with a velocity v at an angle theta with horizontal. At a certain point Q it moves at right angles to its initial direction. Then

A particle of mass m moving in the x - direction with speed 2c is hit by another particle of mass 2m moving in the y - direction with with speed v . If the collision is perfectly inelastic , the percentage loss in the enrgy during the collision is close to .

Assertion (A): Organ transplantation patients are given immunosuppressive durgs. Reason (R): Transplanted tissue has antigens which stimulate the specific immune response of the recipient.

A particle is projected upwards with a velocity of 100 m//s at an angle of 60^(@) with the vertical. Find the time when the particle will move perpendicular to its initial direction, taking g = 10 m//s^(2) .

(x, t), (y, t) diagram of a particle moving in 2-dimensions If the particle has a mass of 500 g, find the force (direction and magnitude) acting on the particle.

Give examples of a one-dimensional motion where (a) The particle moving along positive x-direction comes to rest periodically and moves forward. (b) The particle moving along positive x-direction comes to rest periodically and moves backward.

What is meant by tissue ? Which are two main types of tissue ?