class 11 class 11 A body is thrown horizontally from the top of a tower and strikes the ground after three seconds at an angle of 45° with the horizontal. Find the height of the tower and the speed with which the body was projected. Take g = 9.8

class 11 class 11 A particle is projected with velocity u at angle θ with horizontal. Find the time when velocity vector is perpendicular to initial velocity vector

class 11 class 11 A particle is projected with a velocity of 50 m/s at 37° with horizontal. Find velocity, displacement and co-ordinates of the particle (w.r.t. the starting point) after 2 s.

class 11 class 11 Calculate percentage error in determination of time period of a pendulum T=2π√(l/g) where, land g are measured with ±1% and ±2%.

class 11 class 11 The mass and density of a solid sphere are measured to be (12.4±0.1)kg and (4.6±0.2)kg/m^3. Calculate the volume of the sphere with error limits

class 11 class 11 The volumes of two bodies are measured to be V1=(10.2+0.02)cm3 and V2=(6.4+0.01)cm3. Calculate sum and difference in volumes with error limits.

class 11 class 11 The diameter of a wire as measured by screw gauge was found to be 2.620, 2.625, 2.630, 2.628 and 2.626 cm. Calculate