Motion and Force

A. 15 m
B. 20 m
C. 5 m
D. 25 m

A. equal to 45 deg
B. equal to 90 deg
C. equal to each other
D. none of the above

A. 1 N
B. 10 N
C. 100 N
D. none

A. straight line
B. parabola
C. hyperbola
D. circle

A. at2/2
B. Vt
C. a2t/2
D. at2

A. 5m/s, 1m/s
B. 3m/s, 3m/s
C. 6m/s, 1m/s
D. 4m/s, 2m/s

A. Constant
B. not constant
C. constant if the rate of ejected gases is constant
D. constant for short range rocket.

A. a gas filled ballon
B. bullet fired from gun
C. a football kicked
D. a base ball shot

A. -1
B. 1
C. 2
D. -2

A. momentum changes but K.E remain conserve
B. K.E changes but momentum remain conserve
C. both momentum and K.E changes
D. both momentum and K.E remain conserve