53. A 70-kg stunt artist rides in a rocket sled which slides along a flat inclined surface. At an instant when the sled’s acceleration has a horizontal component of 6.0 m/s2 and a downward component of 2.8m/s2, what is the magnitude of the force on the rider by the sled?
a. 0.83 kN
b. 0.98 kN
c. 0.65 kN
d. 0.68 kN
e. 0.72 kN
مواقع النشر (المفضلة)