Motion in a Straight Line

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Question

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Question 1 :

The displacement in metres of a body varies with time t in second as y = t2 – t – 2. The displacement is zero for a positive of t equal to

1. 1 s
2. 2 s
3. 3 s
4. 4 s
Answer
8194

Question 2 :

A boy starts from a point A, travels to a point B at a distance of 3 km from A and returns to A. If he takes two hours to do so, his speed is

1. 3 km/h
2. zero
3. 2 km/h
4. 1.5 km/h
Answer
8195

Question 3 :

A 180 metre long train is moving due north at a speed of 25 m/s. A small bird is flying due south, a little above the train, with a speed of 5 m/s. The time taken by the bird to cross the train is

1. 10 s
2. 12 s
3. 9 s
4. 6 s
Answer
8196

Question 4 :

A boy starts from a point A, travels to a point B at a distance of 1.5 km and returns to A. If he takes one hour to do so, his average velocity is

1. 3 km/h
2. zero
3. 1.5 km/h
4. 2 km/h
Answer
8197

Question 5 :

A body starts from rest and travels with uniform acceleration on a straight line. If its velocity after making a displacement of 32 m is 8 m/s, its acceleration is

1. 1 m/s²
2. 2 m/s²
3. 3 m/s²
4. 4 m/s²
Answer
8198