KVS SCIENCE QUIZ 8 (EQUATION OF MOTION)

Question 1:

Find the initial velocity of a car which takes 10 seconds to stop after applying brakes. The retardation due to brakes is 2.5 m/s².

25 m/s

20 m/s

22 m/s

24 m/s

Question 2:

The second equation of motion provides the relation between

Position-velocity

Velocity-time

Velocity-momentum

Position-time

Question 3:

Which of the following equations represents the position-velocity relationship?

$\mathrm{V}=\mathrm{u}+\mathrm{at}$

$\mathrm{S}=\mathrm{ut}+1 / 2 a \mathrm{t}^{2}$

$U=V+a t$

$2 a s=v^{2}-u^{2}$

Question 4:

A car falls from a bridge to the ground in 0.8 seconds. What will be its speed when it hits the ground? Given $\left(\mathrm{g}=10 \mathrm{~ms}^{-2}\right)$

$8 \mathrm{~ms}^{-2}$

$8 \mathrm{~ms}^{-1}$

$8 \mathrm{~ms}^{2}$

$8 \mathrm{~ms}^{1}$

Question 5:

Which of the following is the equation of velocity-time relation?

$2 a s=v^{2}-u^{2}$

$\mathrm{V}=\mathrm{2u}+\mathrm{at}$

$\mathrm{v}=\mathrm{u}+\mathrm{at}$

$\mathrm{s}=\mathrm{ut}+1 / 2 \mathrm{at}^{2}$

Question 6:

A car slips down a mountain road and falls. It takes 0.7 seconds to reach the ground. (Suppose $\mathrm{g}=10 \mathrm{~ms}^{-2}$ ) What will be its speed when it hits the ground?

$8 \mathrm{~ms}^{-1}$

$6 \mathrm{~ms}^{-1}$

$4 \mathrm{~ms}^{-1}$

$7 \mathrm{~ms}^{-1}$

Question 7:

An object of mass $150 \mathrm{~kg}$ is accelerated from $6 \mathrm{~ms}^{-1}$ to a velocity of $16 \mathrm{~ms}^{-1}$ in 5 seconds. Find the acceleration.

$10 \mathrm{~ms}^{-2}$

$2 \mathrm{~ms}^{-2}$

$-2 \mathrm{~ms}^{-2}$

$-10 \mathrm{~ms}^{-2}$

Question 8:

A car falls off an edge and drops to the ground in 0.4 seconds. What is its speed on striking the ground? (Take g = 10 ms⁻²)

$4 \mathrm{~ms}^{1}$

$4 \mathrm{~ms}^{-2}$

$5 \mathrm{~ms}^{-1}$

$4 \mathrm{~ms}^{-1}$

Question 9:

Which of the following represents the equation for position-time relation?

2as=v²-u²

s=ut+ (1/2)at²

v=u+at

v=u-at

Question 10:

After starting from steady state a boat moves in a straight line with an acceleration of $3\mathrm{~ms}^{-2}$ at a constant rate for 8 seconds. Find the total distance covered by the boat during this time.

$96 \mathrm{~ms}$

$96 \mathrm{~ms}^{-1}$

$96 \mathrm{~m}$

$96 \mathrm{~ms}^{-2}$