PhysicsTeacher.in

High School Physics

numerical problems in physics for class 9

Solution of Physics Numericals for class 9 (set 1 Q13)

Last updated on November 6th, 2020 at 09:13 am

Problem Statement

A cricket ball of mass 100 g moving at a speed of 30 m/s is brought to rest by a player in 0.03 s. find the average force applied by the player.

Solution:
mass =m= 100 g = 100/1000 kg = 0.1 kg

initial velocity = u=30 m/s

Final velocity = v=0

Time duration = t = 0.03 s


Acceleration = (v-u)/t = (0-30)/0.03 = – 3000/3 = -1000 m/s^2


Average Force = mass * acceleration = 0.1 * (-1000) N = -100N

The magnitude of force is 100 N and the negative sign signifies that it is applied in the direction opposite to the direction of motion of the ball.

Next Problem

Previous Problem

See also  Force in Physics
Scroll to top
error: physicsTeacher.in