external force on her? If the sprinter accelerates at that rate for 20.00 m and then maintains that velocity for the remainder of a 100.00-m dash, what will her time be for the race?
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- A man is pulling a 25 kg wagon forward at some unknown acceleration. Assuming he is pulling the wagon 178N forward with a rope that is found 29o above the horizontal, and the coefficient of friction between the wagon and the ground is 0.300: a) Determine the acceleration of the wagon. b) Would the acceleration of the wagon change if you pushed the wagon at the same angle rather than pulled it? Explain in two sentences.A body weighing 2 kg was acted upon by a horizontal force of 3 N. What speed will the body acquire in 5 s in the absence of friction?A force of 40.0N is applied in the positive x-direction to a block of mass 7.15 kg, at rest on a frictionless surface. HINT (a) What is the block's acceleration (in m/s2)? (Indicate the direction with the sign of your answer.) m/s2 (b) How fast is it going (in m/s) after 5.50 s? m/s
- Three forces acting on an object are given by (-1.95i + 5.70) N, , (s.30l-1.75) N, and , (-49.5) N. The object experiences an acceleration of magnitude 3.60 mys (a) What is the direction of the acceleration? * (counterclockwiise from the +x-axis) (b) What is the mass of the object? kg (c) If the object is initially at rest, what is its speed after 11.0 s? m/s (d) What are the velocity components of the object after 11.0 s? (Let the velocity be denoted by v.) 1) mis I+ Need Help? WehA [m] kg race car has a powerful engine that can produce an acceleration of [a] m/s2 while reaching a speed of [v] miles per hour. At this speed the forces resisting motion (friction, air resistance, etc.) equal [r] times the weight of the car. What is the magnitude of the force (in Newtons) that the race car exerts backward on the ground in order to produce this acceleration?A car of mass ?push=1100 kg is capable of a maximum acceleration of 4.00 m/s2. If this car is required to push a stalled car of mass ?stall=1700 kg, what is the maximum magnitude of the acceleration ? of the two‑car system?