Question

# A teenager of mass *m*_{1} style="color:rgb(0,0,0);"> = *61* kg pushes backward against the ground with his foot as he rides his skateboard. This exerts a horizontal force of magnitude *F*_{foot} = *19.5* N. The skateboard has *m*_{2} = *2.1* kg.What is the expression for the magnitude of the horizontal component of force that the ground exerts on the teenager's foot, F. What is expression in terms of given quantities for the magnitude of the skateboard's acceleration, *a*, while the teenager is pushing backwards on the ground and calculate magnitude of acceleration.

**kg pushes backward against the ground with his foot as he rides his skateboard. This exerts a horizontal force of magnitude**

*61**F*

_{foot}=

**N. The skateboard has**

*19.5**m*

_{2}=

**kg.What is the expression for the magnitude of the horizontal component of force that the ground exerts on the teenager's foot, F. What is expression in terms of given quantities for the magnitude of the skateboard's acceleration,**

*2.1**a*, while the teenager is pushing backwards on the ground and calculate magnitude of acceleration.

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