Question

1)Which one of the fowing statements is not cnereet b) Displacement is a vector quintity. c) Kinetic energy is a scalar quantity d) Coeficient of static Siction is a scalar quantity e) Impulse is a vector quantity 2) The unit of momennm is a) Nkgn b) kgm's c)Nkg's e) None of the ahove 8) The x coordinate of a particle moving along the x-axis at different times is given in the table. Wha ¡s the particle's avenge velocity in ms between t-2sandt 5s? 12 2 36 43 60 28492 a) 92 b) 72 c) 48 d) 36 e) 12 4) A ball is thrown with an initial velocity of ve- 10 m's at angle 8-53, from the top of a buildit of height h-30 m. The vertical displacement (in m) of the ball when it hits the ground is: a) 30 b) 0 c)-30 d)-24 e) -100 田田| 5) A stone is thrown vertically upward. If we neglect air resistance, as it rises, its total mechan energy (kinetic energy + potential energy): a) increases b) decreases c) is constant d) decreases then increases e) increases then decreases

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Answer 1

1) Momentum is a vector quantity, therefore statement (a) is incorrect.

2) The unit of momentum is kgm/s and N.s. Therefore (b) and (d) are correct.

3) The average velocity = x₅-x₂/(5-2) = 60-24/3 = 12 m/s.

4) The vertical displacement is - h = -30 m. Option c. The net displacement above the building is zero (H-H =0).

5) The kinetic energy + potential energy (mechanical energy) is constant as air resistance is 0. Option c is correct.