The average speed over the first 2 seconds is
200/2 cm/second = 100 cm/sec
The average speed over the next 4 seconds is
220/4 cm/sec or 55 cm/sec.
The body has decelerated in 3 seconds from 100 to 55 cm/sec.
That is change in speed of 100–55 = 45 cm/sec in 3 seconds. Or a deceleration is 15 cm/sec per second.
So the body is subject to a deceleration of 15 cm/sec^2.
Now we can write the speed at each second starting from zero. The body starts off at 100 + 15 = 115, and reaches 100- 15 = 85 cm/sec. at the end of the first two seconds. Over the next four seconds the speed must decrease by 4 x 15 = 60cm/sec, down to 25 cm/sec at the beginning of the seventh second. And at the end of that second will be down to 25–15 cm/sec. = 10 cm/sec.
Three identical balls are placed on a frictionless
horizontal surface touching each other. They stick to
each other because of adhesive. Another ball of same
radius and mass m is placed over the void created by
the three balls. Find the forces applied by the balls
kept on the floor to each other if the system remains
in equilibrium.
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A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.
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Last Activity: 10 Months ago
Last Activity: 3 Years ago
Last Activity: 3 Years ago
