physics
posted by nikki
A soccer ball with mass 0.410 kg is initially moving with speed 4.30 m/s. A soccer player kicks the ball, exerting a constant force of magnitude 44.0 N in the same direction as the ball's motion. Over what distance must the player's foot be in contact with the ball to increase the ball's speed to 6.70 m/s?

bobpursley
force(time)=change in momentum=mass(VfVi)

bobpursley
force(time)=change in momentum=mass(VfVi)
That gives you the time of contact. The average velocity is Vf+Vi /2, so distance=avg velocity*time. 
nikki
i still don't understand

nikki
A sled with a mass of 9.50 kg moves in a straight line on a frictionless horizontal surface. At one point in its path, its speed is 2.80 m/s; after it has traveled 2.50 m beyond this point, its speed is 6.50 m/s. Use the workenergy theorem to find the force acting on the sled, assuming that this force is constant and that it acts in the direction of the sled's motion.
Respond to this Question
Similar Questions

Physics
A soccer player kicks a ball into the air at an angle of 36 degrees above the horizontal with a speed of 30m/s a.How long is the soccer ball in the air? 
physics
I have a couple physics questions I need help with please! If you could show me stepbystep directions, I'd really appreciate it! A boat with a horizontal tow rope pulls a water skier. She skis off to the side, so the rope makes an … 
Physics
A soccer player kicks a ball into the air at an angle of 36.0 Degrees above the horizontal. The initial velocity of the ball is +30.0 m/s. 1).How long is the soccer ball in the air 2).What is the horizontal distance traveled by the … 
physics
A 0.405 soccer ball is initially moving at 2.05. A soccer player kicks the ball, exerting a constant 40.5 force in the same direction as the ball's motion. 
physics
A football, if it was kicked when initially at rest, is inflated such that it will move in the direction of the kick with h=0.8 of the kicking foot's velocity We now consider the same ball being kicked while it's moving towards the … 
Physics
A 60 kg soccer player kicks a stationary 0.4 kg ball giving it a speed of 14 m/s. The player's foot is in contact with the ball for 0.08 second. What is the average force on the ball? 
Physics
A 60kg soccer player kicks a stationary 0.4 kg ball giving it a speed of 14 m/s. The player's foot is in contact with the ball for 0.08 second. What is the average force on the ball? 
Physics
A .25 kg soccer ball is rolling at 6 m/s toward a player. The player kicks the ball back in the opposite direction and gives it a speed of 14 m/s. The interaction only lasted .02 seconds. Calculate the average force during the interaction. … 
Physics
A soccer ball of mass 550g is at rest on the ground. The soccer ball is kicked with a force of 108N. The player shoes is in contact with the ball for 0.3m. What is KE of the ball? 
Physics
A 400g soccer ball is moving through the air at 3.57m/s [64.8°W of N] horizontally at the top of its flight. If at that instant, the soccer ball is struck by a 450g crocket ball moving at 5.46m/s [N], and the soccer ball flies off …