7. A 2.0-kg object has a velocity of 4.01 m/s at r- 0. A constant resultant force of (2.0i + 4.0) N the object for 3.0. What is the magnitude of the object's velocity at the end of the 3.0-s interval? a. 9.2 m/s b. 6.3 m/s c. 8.2 m/s d. 7.2 m/s e. 7.7 m/s
7. A 2.0-kg object has a velocity of 4.01 m/s at r- 0. A constant resultant force of (2.0i + 4.0) N the object for 3.0. What is the magnitude of the object's velocity at the end of the 3.0-s interval? a. 9.2 m/s b. 6.3 m/s c. 8.2 m/s d. 7.2 m/s e. 7.7 m/s
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7. A2.0-kg object has a velocity of 4.01 m/s atr-0. A constant resultant force of (2.0i +4.0j) N then acts on
the object for 3.0s. What is the magnitude of the object's velocity at the end of the 3.0-s interval?7
a. 9.2 m/s
b. 6.3 m/s
c. 8.2 m/s
d. 7.2 m's
e. 7.7 m's
8. A 5.0-kg mass sits on the floor of an elevator that has a downward acceleration of 1.0 m/s. On top of the
5.0-kg mass is an object of unknown mass. The force of the elevator on the 5.0-kg mass is 80 N up.
Determine the unknown mass.
a. 3.3 kg
b. 2.4 kg
c. 1.6 kg
d. 4.1 kg
e. 5.0 kg
9. The block shown is pulled across the horizontal surface at a constant speed by the force shown. If M=S
kg. F= 14 N and 0= 35°, what is the coefficient of kinetic friction between the block and the horizonts
surface?
a. 0.44
b. 0.33
c. 0.38
d. 0.28
e. 0.17
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