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Sahay Sir > Question Answers > NCERT Exemplar Class 11 > Physics > Chapter 4 - Laws of Motion > A block of mass 15kg is placed on a long trolley. The coefficient of static friction between the block and the trolley is 0.18. The trolley accelerates from rest with 0.5ms^−2 for 20s and then moves with uniform velocity. Discuss the motion of the block as viewed by, (a) a stationary observer on the ground. (b) an observer moving with the trolley.

A block of mass 15kg is placed on a long trolley. The coefficient of static friction between the block and the trolley is 0.18. The trolley accelerates from rest with 0.5ms^−2 for 20s and then moves with uniform velocity. Discuss the motion of the block as viewed by, (a) a stationary observer on the ground. (b) an observer moving with the trolley.

A shell of mass 0.020kg is fired by a gun of mass 100kg. If the muzzle speed of the shell is 80m/s. what is the recoil speed of the gun?