Question

3. For a body which has moved through a semicircle
in a circle of radius r, find
a. distance
b. displacement.
4. A ball is thrown vertically upwards. After some time,
it returns to the earth. Draw a speed-time graph for
the ball (neglect air resistance).
5. When acceleration is constant, can the direction of
velocity of a body change If yes, how?​

Answer 1

Answer:

3.Answer. displacement is 2r. Explanation: Displacement is the shortest distance travelled from the initial point to the final point.

5.Yes, the direction of velocity of body changes when it's acceleration is constant. For example, when we throw a body in horizontal direction, the direction of velocity continuously changes but acceleration due to gravity is constant. (i) 0 to 30 min, (ii) 0 to 50 min, (iii) 0 to 40 min ?