Motion Test

Result

Motion Test - 4

Score
-
out of -
Rank
-
out of -

TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

How long will it take to stop a car travelling at a speed of 20 m/sec if the uniform acceleration during applying brakes is - 5 m/s²?

A
100 s

B
4 s

C
(1/4) s

D
(1/100) s

Solution

a = - 5 m/s²
u = 20 m/s
Final velocity, v = 0

Using v = u + at, we get
0 = 20 - 5 (t)
⇒ t = 4 seconds
Question 2
1 / -0

Boat A and boat B are moving at 40 km h^-1and 20 km h^-1 respectively. Which of the following options is not a possible value for their relative velocity?

A
40 kmh^-1

B
30 km h^-1

C
20 km h^-1

D
10 km h^-1

Solution

Relative velocities of two bodies range from v_a - v_b to v_a + v_b
Here, 10 km/h^-1 < v_a - v_b
Therefore, this cannot be the relative velocity.