Motion Test

Result

Motion Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Let velocity and acceleration of a body be denoted by v and a, respectively. Which of the following relations holds true?

A
a can be non-zero, when v = 0

B
a must be zero, when v = 0

C
a > 0, when v > 0

D
a < 0, when v > 0

Solution

The body which is thrown upwards has zero velocity at the highest point but still has acceleration due to gravity.
Question 2
1 / -0

If a particle is moving with uniform velocity, its acceleration is

A
infinite

B
finite

C
negative

D
zero

Solution

When the change in velocity is zero, it means that there is no force acting on the body and hence, no acceleration.
Question 3
1 / -0

Three particles, A, B and C are thrown from the top of a tower with the same speed. A is thrown straight up, B is thrown straight down and C is thrown horizontally. If they hit the ground with speeds V_A, V_B and V_C, respectively, which of the following relations holds true?

A
V_A = V_B = V_C

B
V_B > V_C > V_A

C
V_A = V_B > V_C

D
V_A > V_B = V_C

Solution

The sum of kinetic and potential energies will always remain constant. If they have the same height and thrown with the same velocities then, when they hit the ground, their kinetic energy will be same because their potential energies are all zero.

Therefore, if kinetic energies are all same, we can say that
V_A = V_B = V_C