physics problem solution

Solution to problems – class 9 – Set 1 Q36

Problem Statement The mass of sun is 2 × 10^30 kg and the mass of earth is 6 × 10^24 kg. If the average distance between the sun and the earth be 1.5 × 10^8 km, calculate the force of gravitation between them. Solution M1 = mass of the sun = 2 × 1030 kgM2 […]

Solution to problems – class 9 – Set 1 Q 27

Problem Statement A bullet leaves a rifle with a muzzle velocity of 600 m/s. While accelerating through the barrel of the rifle, the bullet moves a distance of 0.8 m. Determine the acceleration of the bullet (assume a uniform acceleration). Solution Initial velocity of the bullet U=0 Final velocity of the bullet = muzzle velocity […]

Solution to problems – class 9 – Set 1 Q 30

Problem Statement A baseball is popped straight up into the air and has a hang-time of 6 s. Determine the height to which the ball rises before it reaches its peak. (Hint: the time to rise to the max height is one-half the total hang-time.) Solution Hang time = Total time required for upward plus […]

Solution to problems – class 9 – Set 1 Q 18

Problem Statement A car starts from rest and accelerates uniformly over a time of 7 seconds for a distance of 98 m. Determine the acceleration of the car. Solution Distance travelled: S = ut + ½ a t2 As u = 0, the equation becomes    S = ½ at2  so, a = 2S/t2 …..(1) t […]

Solution to problems – class 9 – Set 1 Q 20

Problem Statement An airplane accelerates down a runway at 4 m/s2 for 30s until is finally lifts off the ground. Determine the distance traveled before takeoff. Solution S = ut + ½ a t2as u = 0, the equation becomes    S = ½ a t2  a = 4 m/s2   t = 30 secs So the distance […]

Solution to problems – class 9 – Set 1 Q 21

Problem Statement A feather is dropped on the moon from a height of 10 meters. The acceleration of gravity on the moon is one sixth of that on the earth. Determine the time for the feather to fall to the surface of the moon. Solution Acceleration of gravity on the moon = 10/6 m/s2 = […]

Solution to problems – class 9 – Set 1 Q 22

Problem Statement If a rocket-powered sled is accelerated to a speed of 400 m/s in 2 seconds, then what is the acceleration and what is the distance that the sled travels? Solution Acceleration a = (v-u)/t = (400 – 0)/2 = 200 m/s2 Distance travelled by the sled S = ut + ½ a t2 […]

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