Question

please give me answer friends ​

Answer 1

Mass of stone = 1kg = m

initial velocity = 20m/S2= u

final velocity= 0m/S2 ( rest )=v

distance travelled = 50m = s

according to Newton's third law of motion

2as=V2-u2

2×a×50= 0 2 - 20^2

100a= -400

-400/100= a

-4 m/S2= a

F= ma

f= 1×4

force = 4 N