Question

33! A goalkeeper in a game of football pulls
his hands backwards after holding the ball
shot at the goal. This enables the goalkeeper
to
exert larger force on the ball
reduce the force exerted by the balls on
nds
increase the rate of change of
entum
decrease the rate of change of
intun​

Answer 1

Answer:

We denote the velocity of the player with

v

PF

and the relative velocity between the player and the ball be

v

BP

.

Then the velocity

v

BF

of the ball relative to the field is given by

v

PF

=

v

PF

+

v

BP

.

The smallest angle θmin corresponds to the case when

v

BF

⊥

v

PF

. Hence,

θ

min

=180

o

−cos

−1

(

∣

v

BP

∣

∣

v

PF

∣

)

=180

o

−cos

−1

(

6.0m/s

4.0m/s

)=130

o

Answer 2

Answer:

decrease the rate of change of momentum

Explanation:

by pulling hand back he is increasing time and if time increses then momentum decreases because rate of change momentum is mass × velocity /time