Physics

A body covers 200 cm in first 2s and 220 cm in next 4s. What is the velocity at the end of 7s?

The distance traveled by a particle starting from rest and moving with an acceleration of 4/3 m/s^2, in the 3rd second is:

An object is moving such that its velocity is v = 3t^2 + 2t. What is its acceleration at t = 2s?

A stone is dropped into a well 44.1m deep. The sound of splash is heard 3.13s later. The velocity of sound is:

Two trains 120m and 80m long are running in opposite directions with velocities 42 km/h and 30 km/h. The time they take to cross each other is:

A body is projected vertically upwards. If t1 and t2 are times at which it is at height h while ascending and descending respectively, then h is:

Which of the following represents the case where velocity and acceleration are in opposite directions?

A particle is moving in a straight line with initial velocity u and uniform acceleration a. If the sum of distances in t-th and (t+1)-th seconds is 100m, then u + at is:

If the velocity of a particle is given by v = At + Bt^2, where A and B are constants, then the distance traveled by it between 1s and 2s is:

A train starts from station A with acceleration 0.5 m/s^2 and then retards at 1 m/s^2 to stop at station B. If total time is 30s, distance AB is:

A point moves with uniform acceleration and v1, v2, v3 denote average velocities in three successive intervals of time t1, t2, t3. Which of the following is correct?

A stone is dropped from the top of a tower of height h. After 1s another stone is dropped from 20m below the top. Both reach bottom together. Height h is (g=10):

A body is projected vertically upwards with a velocity u. It passes a point at height h at times t1 and t2. The sum t1+t2 is:

If a body is moving in a circle with constant speed, the work done by centripetal force is:

A car travels 1/3 distance with 10 km/h, 1/3 with 20 km/h and 1/3 with 60 km/h. Average speed is:

A body is moving with constant acceleration. If it travels 10m in 2s and 30m in next 2s, what is the initial velocity?

What is the displacement of a point on the rim of a wheel of radius R when the wheel rolls forward half a revolution?

A balloon is at a height of 81m and is ascending with a velocity of 12 m/s. A body is dropped from it. If g=10, the body reaches ground in:

A particle has an initial velocity of 3i + 4j and an acceleration of 0.4i + 0.3j. Its speed after 10s is:

Which of the following physical quantities is a scalar quantity?