Magnitude of an Impulse

IBdoomed

A(n) 0.445 kg football is thrown with a speed
of 15.1 m/s. A stationary receiver catches the
ball and brings it to rest in 0.012 s.
What is the magnitude of the impulse de-
livered to the ball?
Answer in units of kg · m/s

f=m*a
Δp=m*Δv


i used f= ma since a= Δv/t
i got F= .445 kg * 1258.3 ms^-2= 559.94
BUT THIS IS WRONG. any help would be nice 0,o
maybe my understanding of an impulse is wrong?

Delphi51

You found the force. The question asked for impulse. Use impulse = m*Δv or F*Δt