1.the acceleration of a body moving down the smooth plane inclined 30 degrees will be :
A.9.8m/s^2
B.4.9 m/s^2
C.980m/s^2
D.none

2-10 kg stone falling from a height of 10m , strikes the ground ?
A.10m/s
B.14m/s
C.196m/s
D.98m/s

3 a helicopter of mass 3*10^4 rises vertically with a constant speed of 25m/s. What resultant force acts on it ?
A.0
B.3*10^4 N downward
C.3*10^4 upward
D.7.5*10^4 upward

4-how much height does a freely falling bidy of mass 10kg lose in 2 sec ?
A.9.8m
B.19.6m
C.49m
D.4.9m

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