Answer:
(a)
(b)
Explanation:
According to Newton's second law:
Recall that the frictional force is related jointly with the coefficient of friction and normal force . Replacing in the above equation, we get the coefficient of friction:
(a) The coefficient of static friction is related with the force required to set the block in motion:
(b) The coefficient of kinetic friction is related with the force required to keep the block moving with constant speed:
–0.05 m/s
Explanation:
The total momentum of the system player+basketball must be conserved before and after the ball has been thrown.
Before throwing the ball, the total momentum of the system is zero, because can assume both the player and the basketball being at rest:
The total momentum after the ball has been thrown is instead the sum of the momenta of the the player and of the basketball:
where
is the player's mass
is the player's velocity
is the ball's mass
is the ball's velocity
For the conservation of momentum, we have
And the negative sign means that the player travels in the opposite direction to the ball.
Answer:
D) 10 200 m
Explanation:
Speed is known as the rate of change of distance.
distance = speed * time
= 85 ms⁻¹ * 120 s
= 10200 m