1. An elevator mass of 800kg accelerates upward at 1.5 m/s2 Tension in the supporting cable is equal to:

a. 6.6 kn

b. 5.4 kn

c. 7.8 kn

d. 9.0 kn

e. 1.2 kn

2. (1.0 -m) long spring (k=300 N/m) is attached to the top of a smooth incline that makes 20 degree withthe horizontal. When block is attached to the lower end of the spring, the system reaches equilibrium after the spring stretcvhes to a length of 1.2m. mass of block is equal to

a. 18kg

b 6.5 kg

c 110 kg

d 2.1 kg

e. 39 kg

3. An object of mass 10kg initially at rest. If a net force of 10 N is applied on the object for 10 sec, its final speed is equal to:

a. 20 m/s

b 30 m.s

c 88 M/s

d 98 m/s

e 10 m/s

4. 30 kg box is pushed smooth ramp inclined is 15 degree. The applied force is horizontal and causes the box rto accelerate up to the ramp at 3.0 m/s2. Normal force

a. 320 N

b 280 N

c 140 N

d 290 N

e 420 N