Question

A force of 1000N is used to kick a football of mass 0.8kg find the velocity with which the ball moves if it takes 0.8 sec to be kicked.​

Answer 1

The force used to kick the ball is 1000N

The mass of the ball is 0.8 kg

Time is 0.8 seconds

Therefore the velocity can be calculated as follows

F= Mv-mu/t

1000= 0.8(v) - 0.8(0)/0.8

1000= 0.8v- 0.8/0.8

Cross multiply both sides

1000(0.8) = 0.8v

800= 0.8v

divide both sides by the coefficient of v which is 8

800/0.8= 0.8v/0.8

v= 1000m/s

Hence the velocity is 1000m/s

Answer 2

Answer:

1000 m/s

Explanation:

From the question given above, the following data were obtained:

Force (F) = 1000 N

Mass (m) = 0.8 Kg

Time (t) = 0.8 s

Velocity (v) =?

Next, we shall determine the the acceleration of the ball. This can be obtained as follow:

Force (F) = 1000 N

Mass (m) = 0.8 Kg

Acceleration (a) =?

F = ma

1000 = 0.8 × a

Divide both by 0.8

a = 1000 / 0.8

a = 1250 m/s²

Finally, we shall determine the velocity. This can be obtained as follow:

Time (t) = 0.8 s

Acceleration (a) = 1250 m/s²

Velocity (v) =?

a = v/t

1250 = v / 0.8

Cross multiply

v = 1250 × 0.8

v = 1000 m/s

Therefore, the ball will move with a velocity of 1000 m/s.