Étiquette : GRADE 9 PHYSICS
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Motion Under Gravity Numerical: Calculating Ball’s Speed at Point C
Question: A ball is thrown vertically upwards with an initial velocity of 5 ms-1 from point A as shown below. C is a point 10 m vertically below the point A. The the speed of the ball at point C will be(take g=10 ms-2 and neglect air resistance) Solution: Initial velocity u= +5 ms-1 (From…
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Building Height Calculation Using Motion Equations
Question: A particle is projected up with an initial speed of u=10 ms-1 from the top of a building at time t=0.At time t=5 sec, the particle strikes the ground.Find the height of the building. Solution:Building height calculation Solution: Net displacement of the particle is the difference of final position(C) and the initial position(A). Applying…
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Stone’s Fall: Time and Speed Calculation
Question: A stone is dropped from the top of a building of height 20 m.Find the time taken for the stone to reach the ground.Also find the speed of the stone just before hitting the ground. Solution: Time taken to reach the ground Initial velocity of the stone (u) = 0 The displacement for the…
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Calculating Distance Traveled: Motorboat Acceleration
Question: A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 ms-2 for 8.0 s. How far does the boat travel during this time ? Solution: Distance traveled Initial velocity of the motorboat (u) =0 (since the boat starts from rest) Acceleration (a) =3 ms-2 Time…
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A racing car has a uniform acceleration of 4 ms-2. What distance will it cover in 10 seconds after the start ?
Solution: Initial velocity of the racing car u=0 (since the car was initially at rest) Time taken (t) =10 second Acceleration of the racing car (a) =4 ms-2 Distance covered by the car =? Let us substitute the above values in the following equation of motion $$s=ut+\frac{1}{2} a t^2$$ $$s=0(10)+\frac{1}{2}4(10^2)$$ $$s=200 m$$ Therefore the distance…
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