Question

Total mass 57.3 kg. Rides .64km in 14.6 min in constant speed. Aceleración is 9.8 m/s2 what is the kinetic energy?

Answer 1

Explanation & calculations

• Since the whole motion happens at a constant speed, there is no room for an acceleration parallel to the body's direction of motion.
• Therefore, the given acceleration should be perpendicular to the body's direction of motion.

• Then the constant velocity is

$\qquad\qquad \begin{aligned} \small v&\small \frac{0.64\times1000m}{14.6\times60\,s}\\ &=\small 0.73\,ms^{-1} \end{aligned}$

• since the speed is constant, the kinetic energy is constant and that can be calculated by the formula $\small E= \frac{1}{2}mv^2$