Answer:
Approximately
(rounded to two significant figures.)
Step-by-step explanation:
The impulse
on an object is equal to the change in the momentum
of this object. Dividing impulse by duration
of the contact would give the average external force that was exerted on this object.
If an object of mass
is moving at a velocity of
, the momentum of that object would be
.
Let
denote the speed of this ball. Let
denote the velocity of this ball before the contact, and let
denote the velocity of the ball after the contact.
Momentum
of this ball before the contact:
.
Momentum
of this ball after the contact:
.
Impulse, which is equal to the change in momentum:
.
Since the velocity of the ball after the contact is in the
direction,
. The average external force on this ball would be:
.
(Rounded to two significant figures.)