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An object of mass m travelling to the right with velocity 2v collides with another object of mass 2m travelling to the left with velocity 3v as shown in the figure. After the collision, the objects stick together.
Which of the following options is correct regarding the total momentum (magnitude) and total kinetic energy of the two objects?
--Kinetic energy
Momentum | Kinetic energy | |
A | 0 | 0 |
B | 6 mv | (1/2) mv2 |
C | 4 mv | (8/3) mv2 |
D | 4 mv | (4/3) mv2 |
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Read the following statements and select the option that correctly identifies true (T) and false (F) ones.
(i) The number of petals and sepals in a flower is always equal.
(ii) Roots absorb water and minerals from the soil.
(iii) Stamen forms the innermost whorl of a flower.
(iv) Petiole is the short stalk attached to the leaf.
(v) Calyx and corolla form essential whorls of the plant.
(i) | (ii) | (iii) | (iv) | (v) | |
A | T | T | F | T | F |
B | F | T | F | T | F |
C | F | T | T | T | F |
D | T | T | F | F | T |
The no. of petals and the the no. of sepals are always equal. For e.g. There are 5 petals