Force & Motion

A mass "m" is projected vertically upward with velocity u, its velocity becomes v after one second, Distance covered is __________

• u + v

• u + g

• u + g/2

• u - g/2

For one complete rotation, the ratio between distance and displacement is equal to ______

• 1

• <1

• 0

• infinity

Which of the following is correct representation of speed vs time for a body projected vertically upward ?

• a

• b

• c

• d

A bomber jet while chasing another jet is flying at 500 km/s. It opens fire, then its velocity _____

• remains constant

• increases

• decreases

• none of these

Water while flowing through a pipe with 100 m/s exerts a force of 1 kN. The volume rate flow is equal to _____

• 1000 m³/s

• 100 m³/s

• 0.001 m³/s

• 0.01 m³/s

The acceleration of a rocket ______ as it gains height

• increases

• decreases

• remains same

• becomes equal to "g"

A projectile covers horizontal distance of 100m when projected at an angle of 35°. It will have the range of 100 m even it is projected with _____

• 15°

• 25°

• 55°

• 75°

Ratio of maximum height obtained by projectile and time taken to reach maximum height is equal _____

• 1/4 tanθ

• 1/4 cotθ

• 1/2 vi cosθ

• 1/2 vi sinθ

A missile of mass 500 kg is fired from the ground with 40 m/s velocities at an angle of 60° with horizontal. K.E of missile at maximum height is ____

• 50 KJ

• 75 KJ

• 100 KJ

• 125 KJ

A rocket is fired horizontally from the top of a cliff at 100 m/s, it hits the ground in 10 seconds, height of the cliff is _____

• 980 m

• 490 m

• 49 m

• 98 m