Question

Write the SI units of time, distance, displacement, speed, velocity and acceleration.
2. An object is moving with uniform speed in a circle of radius 7m. Calculate the distance covered and the displacement when it completes half a circle. What type of motion does the object possess?
3. A body rises vertically to a height of 100m in 5s and then comes back to the same position after another 5s. Find
a. The distance covered
b. The displacement
c. The average speed
d. The average velocity of the body
4. A stone tied to a thread is moved with a constant speed of 10 m/s along a circular path, but still its motion is said to be accelerated. Why?
5. A car acquires a velocity of 72 kmh-1 in 10s starting from rest. Find
a. The acceleration
b. The average velocity
6. Starting with an initial velocity of 2 m/s, Rohan pressed the accelerator of his car to attain a velocity of 12 m/s in 30s. Then he applies the brakes such that the car comes to rest in the next 15s. Calculate the acceleration of the car in both the cases.

Answer 1

Answer:

1.))The SI unit of distance and displacement is the meter. The SI unit of time is the second. The SI unit of speed and velocity is the ratio of two — the meter per second .

2.))Answer. The object possesses circular motion. Explanation: When an object is moving with uniform speed in a circle of radius R then the distance travelled by the object when it completes half of the circle is equal to the half of the circumference of the circle.

3.))A body rises vertically upwards to a height of 100 m in 5 seconds, then comes back to the same position after another 5 s. Find the distance travelled , displacement, average speed and average velocity of the body.

4.)) (Ans. Distance = 200 m, Displacement = 0, Average speed = 20m/s, Average velocity = 0)The stone experience a radial force which keeps on changing the direction of motion of stone without changing its speed. But there is a change in velocity, Therefore it is called an accelerated motion HERE IS UR ANSWER MARK ME AS BRAINLIEST AND SUPPORT ME PLZ......