Physics Answers

1. A stone is thrown straight upward with a velocity of 30 m/s. What was its maximum height?, b) What is the time taken to reach the maximum height?, c) What is the velocity of the stone when it is 60 m from the ground? (Assume the ground as the initial frame of reference)

An object starts from rest with a constant acceleration of 10 ft/s² along a straight road. Determine the velocity after 3.5 sec, b) the average velocity for the 3.5 seconds interval, and c) the distance travelled in this given time.

An automobile and a truck start from rest at the same instant, with the automobile

initially at some distance behind the truck. The truck has a constant acceleration of 2

m/s2 and the automobile at an acceleration of 3 m/s2

. The automobile overtakes the

truck after the truck has moved 75 m. Try to draw the figure.

a) How long does it take the auto to overtake the truck?

b) How far was the auto behind the truck initially?

c) What is the velocity of each when they are abreast?

A 1205 kg car is running a speed of 35 m/s along a level road. How large a constant retarding force is required to stop it in 15 s? 

A man runs around a circular track of 800 meters radius for 30 seconds, starting at a point directly to the right of the center and goes in a counterclockwise manner. He goes 5 meters per second for the first 15 seconds, runs 90 meters for the next 6 seconds and then 180 meters for the rest of the course. What was his average speed?

An equipotential surface that surrounds a + 5.0 μC point charge has a radius of 5.0 cm. What is the potential of this surface? *

A particle of mass 10kg is placed on a rough plane inclined at angle of 30degree to the horizontal. What horizontal force is required to move up the plane

A car is being driven along a road at 25 m s-1 when the driver suddenly notices that there is a fallen tree blocking the road 65 m ahead. The driver immediately applies the brakes giving the car a constant acceleration of -5 m s-2.  How far in front of the tree does the car come to rest?

In travelling the 70 cm along a rifle barrel, a bullet uniformly accelerates from rest to a velocity of 210 m s-1. Find the acceleration involved and the time taken for which the bullet is in the barrel.

A car is being driven along a road at 25 m s-1 when the driver suddenly notices that there is a fallen tree blocking the road 65 m ahead. The driver immediately applies the brakes giving the car a constant acceleration of -5 m s-2.  How far in front of the tree does the car come to rest? Ans: 2.5 m before.