Question

give some extra Q. for class 9 science chapter 8 motion​

Answer 1

Answer:

differentiate between vector and scalar quantity

Scaler- 1)It has only one magnitude

2) for example speed and distance

vector- 1) it has both magnitude and direction

2) For example displacement and velocity.

hope it helps

Answer 2

Answer:

I have Some, Here you go!

Explanation:

1. A motorcyclist drives from A to B with a uniform speed of 30 km h–1 and returns back with a speed of 20 km h–1. Find its average speed.
2. Two stones are thrown vertically upwards simultaneously with their initial velocities u1 and u2 respectively. Prove that the heights reached by them would be in the ratio of u 21 : u 22 Hint :( Assume upward acceleration is –g and downward acceleration to be +g )
3. John is riding the Giant Drop at Canada. If John free falls for 2.6 seconds, what will be his final velocity and how far will he fall?
4. It was once recorded that a Jaguar left skid marks that were 290 m in length. Assuming that the Jaguar skidded to a stop with a constant acceleration of -3.90 m/s2 , determine the speed of the Jaguar before it began to skid.
5. With what speed in miles/ h (1 m/s= 2.23 mi/hr) must an object be thrown to reach a height of 91.5 m (equivalent to one football field)? Assume negligible air resistance.
6. A bullet is moving at a speed of 367 m/s when it embeds into a lump of moist clay. The bullet penetrates for a distance of 0.0621 m. Determine the acceleration of the bullet while moving into the clay. Hint:(assume a uniform acceleration.)

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