Kinematics Test

Result

Kinematics Test - 3

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

A particle starts from rest and moving along a straight line travels 19m in the tenth second. The acceleration of the particle is given by -

A
1.9 m/s²

B
2 m/s²

C
3.8 m/s²

D
1 m/s²

Solution

S_n = 19 m (given)

S_n = a/2 (2n – 1)

19 m = a/2(10 × 2 – 1)

19 = 19. a/2; a = 2 m/s²
Question 2
1 / -0

A person standing near the edge of the top of a building throws two balls A and B. The ball A is thrown vertically upwards and B is thrown vertically down with same speed. The ball A hits the ground with speed v_A and ball B hits the ground with speed v_B, then –

A
v_A > v_B

B
v_A < v_B

C
v_A = v_B

D
Information incomplete

Solution

The ball 'A' thrown vertically upward will return back to the initial point with the same thrown speed but its direction will be downwards. This return speed is exactly the same as the speed of ball 'B'. So both of them will hit the ground with equal velocity.