A shopper is pushing a 14.8-kilogramshopping cart, initially at rest, with a 15.

Question

A shopper is pushing a 14.8-kilogramshopping cart, initially at rest, with a 15.0 newton force that isparallel to the floor. The force of friction on the cart is5.0 newtons.
Use the work-kinetic energy theorem todetermine the speed of the cart after the cart has been pushed for5.0 meters.
1 m/s
A 65.0-kilogram child starts fromrest from the top of a frictionless slide that is 5.0 meters tall. The bottom of the slide is20.2 centimeters above the ground.
What is the child's speed at the bottom of theslide?
1 m/s Use the work-kinetic energy theorem todetermine the speed of the cart after the cart has been pushed for5.0 meters.
1 m/s
A 65.0-kilogram child starts fromrest from the top of a frictionless slide that is 5.0 meters tall. The bottom of the slide is20.2 centimeters above the ground.
What is the child's speed at the bottom of theslide?
1 m/s What is the child's speed at the bottom of theslide?
1 m/s

Explanation / Answer

the speed of the cart after the cart has been pushed for5.0 meters work done=kinetic energy (15-5)*5=1/2*14.8*v2 =>v=2.6 m/s (b)conservation of energy potential energy=kinetic energy at the botttom. 65*g*(5-0.202)=65*v2/2 =>v=9.7 m/s =>v=2.6 m/s (b)conservation of energy potential energy=kinetic energy at the botttom. 65*g*(5-0.202)=65*v2/2 =>v=9.7 m/s

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