Mechanics | Relativity Answers

5. X started a journey to a village 9 km away from his house. After travelling 6 km at a speed of 40km/hr., the car stopped running. He then travelled by rickshaw at a speed of 10 km/ hr. After travelling a distance of 2 km, he left the rickshaw and covered the remaining distance on foot at a speed of 4 km/hr. Find the average speed.

a 20 kg box falls from the back of a truck and hits the ground with a speed of 15m/s. it slides for a distance of 45m before coming to rest. determine the work done on the box by
friction

What is the weight of 76kg astronaut on earth? What is the weight of the astronaut on the moon ( g = 1.67 m/s ^2)? What is the weight of the astronaut on mars (g= 3.6 m/s ^2)?

1. A new 75 m long concrete footpath is constructed down a Sydney street. Estimate how
many 2 cm thick expansion joints are required to accommodate the change in length of
the path from the coldest midwinter’s night to the hottest summer’s day.

A car is moving with a constant velocity 0f 30m per second. If the car has to overcome a frictional force of 700N, what is the power of its engine?

a 20kg wagon is pulled along the level ground by a rope inclined at 30 degree above the horizontal.
A friction force of 30N opposes the motion. How large is the pulling force if the wagon is moving with (a) constant speed and (b) an acceleration of 0.40 m/s

i need formula for my collision
simulation program.In that i am using vector concept to detect the collision and the path after collision.But i cannot able to trace the path after collision.

during a test a rocket travels upward at 75meters/sec^2,and when it is 40 meters from the ground its engine fails.determine the maximum height sb reached by the rocket and its speed just before it hits the ground.while in motion the rocket is subjected to a constant downward acceleration of 9.81meters/sec*sec due to gravity.meglect the effect air resistance?

what is static friction?

A particle is acted upon by 3 forces in one plane equal to 2,2(2)^1/2,1 N respectively.First is horizontal,second acts at 45 degree to the horizontal and 3rd is vertical.What is the magnitude of resultant force?