CBSE
A missile is fired at maximum range with an initial velocity of 20 m/s. If g =10 m/s2 the range of the missile is
50 m
60 m
20 m
20 m
The velocity of a projectile at the initial point A is (2 i + 3 j) m/s. Its velocity (in m/s) at point B is,
-2 i - 3 j
-2 i + 3 j
2 i - 3 j
2 i - 3 j
Two particles A and B, move with constant velocities v1 and v2. At the initial moment, their position vectors are r1 and r2 respectively. The condition for particles A and B for their collision is
r1.v1 = r2.v2
r1 x v1 = r2 x v2
r1 x v1 = r2 x v2
A Particle has initial velocity and has acceleration. Its speed after 10s is
7 unit
8.5 unit
8.5 unit
A particle moves a distance x in time t according to equation x = (t +5)-1. The acceleration of particle is proportional to
(velocity)3/2
(distance)2
(distance)-2
(distance)-2
Six vectors and have the magnitudes and directions indicated in the figure. Which of the following statements is true?
Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be
2v
0
1.5 v
1.5 v
A body is moving with velocity 30 m/s towards east. After 10 s its velocity becomes 40 m/s towards the north. The average acceleration of the body is
7 m/s2
5 m/s2
5 m/s2
A projectile is fired an angle of 45o with the horizontal.Elevation angle of the projectile at the highest point as seen from the point of projection is
60o
tan-1(1/2)
A particle of mass m is released from rest and follows a parabolic path is shown. Assuming that the displacement of the mass from the origin is small, which graph correctly depicts the position of the particle as a function of time?