Question

Велосипед движется на подъём с замедлением 0,2 м/с^2. Остановиться ли он через 20 с,если начальная скорость 5 м/с? Через сколько секунд он остановится?

Answer 1

Через 25 секунд т.к а=v0/t

Answer 2

Calculation of Stopping Time

To calculate the time it takes for the bicycle to come to a stop, we can use the equation of motion:

v = u + at

Where: - v is the final velocity (0 m/s, as the bicycle comes to a stop) - u is the initial velocity (5 m/s) - a is the acceleration (in this case, the deceleration due to the uphill slope, which is -0.2 m/s^2) - t is the time taken to come to a stop

Rearranging the equation, we have:

t = (v - u) / a

Substituting the given values, we get:

t = (0 - 5) / (-0.2) = 25 seconds

Therefore, it will take the bicycle 25 seconds to come to a stop.

Calculation of Time to Stop

To find out after how many seconds the bicycle will come to a stop, we can use the same equation of motion:

v = u + at

Rearranging the equation, we have:

t = (v - u) / a

Substituting the given values, we get:

t = (0 - 5) / (-0.2) = 25 seconds

Therefore, the bicycle will come to a stop after 25 seconds.

Please note that these calculations assume constant deceleration and no other external factors affecting the motion of the bicycle.