Question

A lift accelerated downward with acceleration 'a'. A man in the lift throws a ball upward with acceleration $a _ { 0 } \left( a _ { 0 } < a \right)$ Then acceleration of ball observed by observer, which is on earth, is

• A. $\left( a + a _ { 0 } \right)$ upward
• B. $\left( a - a _ { 0 } \right)$ upward
• C. $\left( a + a _ { 0 } \right)$ downward
• D. $\left( a - a _ { 0 } \right)$ downward

Answer 1

Answer: (D)

$\left( a - a _ { 0 } \right)$ downward

Answer 2

The effective acceleration of ball observed by observer on earth = (a – a₀) As $a _ { 0 } < a$ hence net acceleration is in downward direction.