Question

A girl flips a coin upwards and catches it 1.2 seconds later. How fast did she toss the coin?

Answer 1

Answer:

22.5

Explanation:

Answer 2

Answer:

3

10

s

As it is a non-inertial frame the net acceleration of the particle will be the sum of the acceleration due to gravity and the acceleration of the elevator.

=10+2=12m/s

2

When coin will fall back into his hands the displacement of the particle will be zero with respect to the man

Also initial velocity of coin, u=20 m/s

Using formula for displacement:-

s=ut+

2

1

at

20=20t−

21 ×12t 2

t= 6

20= 310 sec