Mechanics PYQs for BITSAT | ExamElite

When a body is dropped from a height h, then it hits the ground with a momentum p. If the same body is dropped from a height which is three times more than previous height, the percentage change in momentum when it hits the ground is

A cyclist speeding at 6 m/s in a circle of 18 m radius makes an angle \(\theta\) with the vertical. The minimum possible value of coefficient of friction between the tyres and the ground is

A projectile is projected with the velocity of \((3\widehat i + 4\widehat j)\) m/s. The horizontal range of the projectile will be

A boat crosses a river from part \(A\) to part \(B\), which are just on the opposite side. The speed of the water. \(v_\omega\) and the of boat is \(v_B\) relative to still water. Assume \(v_B=\sqrt{2} v_\omega\). What is the time taken by the boat, if it has to cross the river directly on the \(A B\) line (\(D=\) width of the river) ?

A block of mass 10 kg slides down a rough slope which is inclined at an angle of $45^{\circ}$ to the horizontal. The coefficient of sliding friction is 0.30 . When the block has slide 5 m , the work done on the block by the force of friction is nearly