Example: A soccer player starts from rest and accelerates forward, reaching a velocity of 8.00 m/s in 2.50 s. (a) What was his average acceleration? (b) What average force did he exert backward on the ground to achieve this acceleration? The player's mass is 70.0 kg, and air resistance is negligible.

Example: A soccer player starts from rest and accelerates forward, reaching a velocity of 8.00 m/s in 2.50 s. (a) What was his average acceleration? (b) What average force did he exert backward on the ground to achieve this acceleration? The player's mass is 70.0 kg, and air resistance is negligible.

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter3: Motion Along A Straight Line

Section: Chapter Questions

Problem 63P: A care package is dropped out of a cargo plane and lands in the forest. If we assume the care...

See similar textbooks

Similar questions

A 9500-kg test missile blasts off vertically from the ground with a constant upward accelerationof 2.28 m/s^2. When it has reached a height of 550 m, its engines suddenly fail; the only forceacting on it is now gravity. a) What is the maximum height reached? b) How much time will elapse after engine failure before the rocket comes crashing down theground, and how fast will it be moving just before it crashes? c) Sketch a vs t, v vs t, and y vs t graphs of the rocket’s motion from the instant of blast-off tothe instant just before it strikes the ground.
Question 2.20 in the image.
Physics: Help me please im confused
A jet aircraft with a mass of 4,375 kg has an engine that exerts a force (thrust) equal to 60,400 N. (a) What is the jet's acceleration when it takes off? (Give the magnitude.) m/s2 (b)What is the jet's speed after it accelerates for 5 s? (Assume it starts from rest.) m/s (c) How far does the jet travel during the 5 s?
Suppose a car is involved in a collision in which it is brought to a constant speed of 31 m/s. Fortunately, the seatbelt worn by the 65 kg driver brought the driver to rest in 350 ms. How much force is exerted by the seat on the driver? Compute for the acceleration experienced by the driver during collision and how this is compared to the acceleration due to gravity.
A 200-g box slides across a frictionless plane inclined at 30 degrees with respect to the horizontal. What isis its acceleration in m/s2?
A powerful motorcycle can produce an acceleration of 3.50 m/s² while traveling at 90.0 km/h. At that speed the forces resisting motion, including friction and air resistance, total 400 N. (Air resistance is analogous to air friction. It always opposes the motion of an object.) What force does the motorcycle exert backward on the ground to produce its acceleration if the mass of the motorcycle with rider is 245 kg?
An 71 kg baseball player is running to third base moving at 3.3m / s and then begins to slide. The force of friction with the dirt is 372 N and his speed is reduced to zero just as he reaches base . What is his acceleration ?
A net force of 81.6 N propels a 4.00-kg model rocket. After being launched from rest, how fast is the rocket traveling after 2.00 s? Enter the numerical value in Sl units.
A 900 kg car is pulling a 275 kg trailer. Together, the car and trailer have an acceleration of 2.21 m/s2 in the forward direction. Neglecting frictional forces on the trailer, determine the following. (Indicate the direction with the sign of your answer. Take the forward direction to be positive.) ANSWER D ONLY PART ABOUT DIRECTION ANGLE, I ALREADY HAVE THE OTHER ANSWERS. (a) the net force on the car 1989 N(b) the net force on the trailer 607.5 N(c) the force exerted by the trailer on the car -607.5 N(d) the resultant force exerted by the car on the road magnitude 9149 N direction
An object with a mass of 4 kg lies on a rough plane inclined at 20 degrees to horzontal. A force of 35N is applied parallel and up the plane. The object accelerates at 2.5 m/s2. What is the Uk between the object and the plane?
An object accelerates at 4m/s2 due to a 20N force applied to it. (a) What amount of force is needed to produce an acceleration of 2.0 m/s2 to the same object? (b) What amount of force is needed to produce an accelaration of 12m/s2 to the same object? I ALREADY NEED IT PLEASE ANSWER?