Kinematics Test

Result

Kinematics Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Statement-1 : A body can have acceleration even if its velocity is zero at a given instant of time.
Statement-2 : A body is numerically at rest when it reverses its direction

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanations of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

When a body is thrown upwards vertically, at the highest point its velocity becomes zero (while reversing its direction) but gravitational force continuous to act on it so it has acceleration in downward direction even at the highest point.
Question 2
1 / -0

Statement-1 : A particle having zero acceleration must have constant speed.
Statement-2 : A particle having constant speed must have zero acceleration.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanations of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

If acceleration is zero then velocity is constant. Hence the magnitude of the velocity will be constant; therefore, speed will be constant.

In uniform circular motion speed is constant but acceleration exists due to change in direction of velocity. So that statement-2 is wrong.