Question

7. A stone is released from the top of a tower of height 19.6 m. Then its final velocity just before
touching the ground will be
c) 19.6 m/s
d) 3841.4 m/s
a) 384.16 m/s b) 196 m/s
(Take g = 9.8m/s^2)
08. An object having mass equal to 350g occupies 200cm of the space. When this object is thrown into a
river what will be the condition of this object there? (Density of water = 1g/cm^3)
DO
a) It will float on the surface of water
b) It will float fully submerged in the liquid
c) It will sink in the liquid
d) It will float partially submerged in the liquid
9. When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles
stay at the top.
This principle is used in
a) Centrifugation
b) Fractional distillation c) Evaporation d) Tunneling
OR
Give an example of a triatomic molecule of an element.​

Answer 1

Answer:

Initial Velocity u=0

Fianl velocity v=?

Height, s=19.6m

By third equation of motion

v2=u2+2gs

v2=0+2×9.8×19.6

v2=384.16

⇒v=19.6m/s