A pebble is released from rest at a certain height and falls freely, reaching an impact speed of `4 m//s` at the floor. Next, the pebble is thrown down with an initial speed of `3 m//s` from the same height. What is its speed at the floor ?

Options

A. `4 m//s`
B. `5 m//s`
C. `6 m//s`
D. `7 m//s`

Answer

B