A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively?
A projectile can have the same range R for two angles of projection. If t1 and t2 be the time of flights in the two cases, then the product of the two time of flights is proportional to?
A particle is moving eastwards with a velocity of 5 m/s. In 10 s the velocity changes to 5 m/s northwards. The average acceleration in this time is
A ball is thrown from a point with a speed v0 at an angle of projection 
. From the same point and at the same instant a person starts running with a constant speed 
to catch the ball. Will the person be able to catch the ball? If yes, what should be the angle of projection?
Which of the following statements is false for a particle moving in a circle with a constant angular speed?
A projectile can have the same range R for two angles of projection. If T1 and T2 be the time of flights in the two cases, then the product of the two time of flights is directly proportional to?
The coordinates of a moving particle at any time t are given by 
and 
. The speed of the particle at time t is given by
A boy playing on the roof of a 10 m high building throws a ball with a speed of 10 m/s at an angle of 30° with the horizontal. How far from the throwing point will the ball be at the height of 10 m from the ground ?
Two forces are such that the sum of their magnitudes is 18 N and their resultant is 12 N which is perpendicular to the smaller force. Then the magnitudes of the forces are?
A particle located at x = 0 at time t = 0, starts moving along the positive x-direction with a velocity v that varies as
.The displacement of the particle varies with time as
What amount of CaO is produced by 1g of calcium?
Calculate the volume of CO2 obtained at STP when 3.5 g of K2CO3 reacts with excess of dil HCl?