Physics
Force and Motion
Page 10 of 11
#73 If velocity time graph is a straight line parallel to time axis then body is
A) Moving with zero acceleration
B) Moving with constant velocity
C) Covering equal displacement in equal intervals of time
D) All of these
#74 Two masses of 1 g and 4 g are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is
A) 4 : 1
B) 2 : 1
C) 1 : 2
D) 1 : 16
#75 The momentum of particle is numerically equal to its kinetic energy. What is the velocity of the particle?
A) 9 m/s
B) 3 m/s
C) 2 m/s
D) 1 m/s
#76 The range of a projectile when launched at an angle of 15° with the horizontal is 1.5 m. its range, when launched at 45° with the same speed is
A) 3.0 m
B) 1.5 m
C) 6.0 km
D) 0.75 km
#77 A bomb of mass 12 kg, initially at rest, explodes into two pieces of masses 4 kg and 8 kg. Speed of the 8 kg mass is 6 m/s. The kinetic energy of the 4 kg mass is
A) 32 J
B) 48 J
C) 114 J
D) 288 J
#78 A stone is thrown vertically upwards with a velocity of 30 m/s. If the acceleration due to gravity is 10 m/s², what is the distance traveled by the particle during the first second of its motion?
A) 30 m
B) 25 m
C) 10 m
D) None of these
#79 A body starting from rest covers a distance of 0.45 km and acquires a velocity of 300 km/hr. Its acceleration will be
A) 0.092 m/s²
B) 0.5 m/s²
C) 7.71 m/s²
D) 0.15 m/s²
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