Question

9. Assertion :- An object thrown vertically upward with certain velocity
'v' reaches maximum height and fall back with same velocity.
Reason :- Whenever an object falls towards the earth, gravitational
force of the earth causes acceleration.​

Answer 1

Answer:

True that acceleration is called acceleration due to gravity denoted by small (g)

Answer 2

Both assertion and reason are true and the reason is the correct explanation of the assertion.

• As an object is thrown upwards its velocity is constantly decreasing and the velocity at the top (highest point it reaches) is zero.
• As the object falls from the top back to the starting point, its velocity constantly increases from zero back to the initial value of projection.
• The values of initial and final velocity will be the same if conditions are identical because the only influence they are under is acceleration due to gravity (g) which is a constant.
• Thus, the values of initial and final velocity is the same but their signs will be the opposite.